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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* Goldfish PIC
*
* (c) 2020 Laurent Vivier <laurent@vivier.eu>
*
*/
#include "qemu/osdep.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qemu/log.h"
#include "trace.h"
#include "hw/intc/intc.h"
#include "hw/intc/goldfish_pic.h"
/* registers */
enum {
REG_STATUS = 0x00,
REG_IRQ_PENDING = 0x04,
REG_IRQ_DISABLE_ALL = 0x08,
REG_DISABLE = 0x0c,
REG_ENABLE = 0x10,
};
static bool goldfish_pic_get_statistics(InterruptStatsProvider *obj,
uint64_t **irq_counts,
unsigned int *nb_irqs)
{
GoldfishPICState *s = GOLDFISH_PIC(obj);
*irq_counts = s->stats_irq_count;
*nb_irqs = ARRAY_SIZE(s->stats_irq_count);
return true;
}
static void goldfish_pic_print_info(InterruptStatsProvider *obj, GString *buf)
{
GoldfishPICState *s = GOLDFISH_PIC(obj);
g_string_append_printf(buf,
"goldfish-pic.%d: pending=0x%08x enabled=0x%08x\n",
s->idx, s->pending, s->enabled);
}
static void goldfish_pic_update(GoldfishPICState *s)
{
if (s->pending & s->enabled) {
qemu_irq_raise(s->irq);
} else {
qemu_irq_lower(s->irq);
}
}
static void goldfish_irq_request(void *opaque, int irq, int level)
{
GoldfishPICState *s = opaque;
trace_goldfish_irq_request(s, s->idx, irq, level);
if (level) {
s->pending |= 1 << irq;
s->stats_irq_count[irq]++;
} else {
s->pending &= ~(1 << irq);
}
goldfish_pic_update(s);
}
static uint64_t goldfish_pic_read(void *opaque, hwaddr addr,
unsigned size)
{
GoldfishPICState *s = opaque;
uint64_t value = 0;
switch (addr) {
case REG_STATUS:
/* The number of pending interrupts (0 to 32) */
value = ctpop32(s->pending & s->enabled);
break;
case REG_IRQ_PENDING:
/* The pending interrupt mask */
value = s->pending & s->enabled;
break;
default:
qemu_log_mask(LOG_UNIMP,
"%s: unimplemented register read 0x%02"HWADDR_PRIx"\n",
__func__, addr);
break;
}
trace_goldfish_pic_read(s, s->idx, addr, size, value);
return value;
}
static void goldfish_pic_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
GoldfishPICState *s = opaque;
trace_goldfish_pic_write(s, s->idx, addr, size, value);
switch (addr) {
case REG_IRQ_DISABLE_ALL:
s->enabled = 0;
s->pending = 0;
break;
case REG_DISABLE:
s->enabled &= ~value;
break;
case REG_ENABLE:
s->enabled |= value;
break;
default:
qemu_log_mask(LOG_UNIMP,
"%s: unimplemented register write 0x%02"HWADDR_PRIx"\n",
__func__, addr);
break;
}
goldfish_pic_update(s);
}
static const MemoryRegionOps goldfish_pic_ops = {
.read = goldfish_pic_read,
.write = goldfish_pic_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.max_access_size = 4,
.impl.min_access_size = 4,
.impl.max_access_size = 4,
};
static void goldfish_pic_reset(DeviceState *dev)
{
GoldfishPICState *s = GOLDFISH_PIC(dev);
int i;
trace_goldfish_pic_reset(s, s->idx);
s->pending = 0;
s->enabled = 0;
for (i = 0; i < ARRAY_SIZE(s->stats_irq_count); i++) {
s->stats_irq_count[i] = 0;
}
}
static void goldfish_pic_realize(DeviceState *dev, Error **errp)
{
GoldfishPICState *s = GOLDFISH_PIC(dev);
trace_goldfish_pic_realize(s, s->idx);
memory_region_init_io(&s->iomem, OBJECT(s), &goldfish_pic_ops, s,
"goldfish_pic", 0x24);
}
static const VMStateDescription vmstate_goldfish_pic = {
.name = "goldfish_pic",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_UINT32(pending, GoldfishPICState),
VMSTATE_UINT32(enabled, GoldfishPICState),
VMSTATE_END_OF_LIST()
}
};
static void goldfish_pic_instance_init(Object *obj)
{
SysBusDevice *dev = SYS_BUS_DEVICE(obj);
GoldfishPICState *s = GOLDFISH_PIC(obj);
trace_goldfish_pic_instance_init(s);
sysbus_init_mmio(dev, &s->iomem);
sysbus_init_irq(dev, &s->irq);
qdev_init_gpio_in(DEVICE(obj), goldfish_irq_request, GOLDFISH_PIC_IRQ_NB);
}
static const Property goldfish_pic_properties[] = {
DEFINE_PROP_UINT8("index", GoldfishPICState, idx, 0),
};
static void goldfish_pic_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
InterruptStatsProviderClass *ic = INTERRUPT_STATS_PROVIDER_CLASS(oc);
device_class_set_legacy_reset(dc, goldfish_pic_reset);
dc->realize = goldfish_pic_realize;
dc->vmsd = &vmstate_goldfish_pic;
ic->get_statistics = goldfish_pic_get_statistics;
ic->print_info = goldfish_pic_print_info;
device_class_set_props(dc, goldfish_pic_properties);
}
static const TypeInfo goldfish_pic_info = {
.name = TYPE_GOLDFISH_PIC,
.parent = TYPE_SYS_BUS_DEVICE,
.class_init = goldfish_pic_class_init,
.instance_init = goldfish_pic_instance_init,
.instance_size = sizeof(GoldfishPICState),
.interfaces = (InterfaceInfo[]) {
{ TYPE_INTERRUPT_STATS_PROVIDER },
{ }
},
};
static void goldfish_pic_register_types(void)
{
type_register_static(&goldfish_pic_info);
}
type_init(goldfish_pic_register_types)
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