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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* QEMU Loongson 7A1000 msi interrupt controller.
*
* Copyright (C) 2021 Loongson Technology Corporation Limited
*/
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "hw/irq.h"
#include "hw/intc/loongarch_pch_msi.h"
#include "hw/intc/loongarch_pch_pic.h"
#include "hw/pci/msi.h"
#include "hw/misc/unimp.h"
#include "migration/vmstate.h"
#include "trace.h"
static uint64_t loongarch_msi_mem_read(void *opaque, hwaddr addr, unsigned size)
{
return 0;
}
static void loongarch_msi_mem_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
LoongArchPCHMSI *s = (LoongArchPCHMSI *)opaque;
int irq_num;
/*
* vector number is irq number from upper extioi intc
* need subtract irq base to get msi vector offset
*/
irq_num = (val & 0xff) - s->irq_base;
trace_loongarch_msi_set_irq(irq_num);
assert(irq_num < s->irq_num);
qemu_set_irq(s->pch_msi_irq[irq_num], 1);
}
static const MemoryRegionOps loongarch_pch_msi_ops = {
.read = loongarch_msi_mem_read,
.write = loongarch_msi_mem_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void pch_msi_irq_handler(void *opaque, int irq, int level)
{
LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(opaque);
qemu_set_irq(s->pch_msi_irq[irq], level);
}
static void loongarch_pch_msi_realize(DeviceState *dev, Error **errp)
{
LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(dev);
if (!s->irq_num || s->irq_num > PCH_MSI_IRQ_NUM) {
error_setg(errp, "Invalid 'msi_irq_num'");
return;
}
s->pch_msi_irq = g_new(qemu_irq, s->irq_num);
qdev_init_gpio_out(dev, s->pch_msi_irq, s->irq_num);
qdev_init_gpio_in(dev, pch_msi_irq_handler, s->irq_num);
}
static void loongarch_pch_msi_unrealize(DeviceState *dev)
{
LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(dev);
g_free(s->pch_msi_irq);
}
static void loongarch_pch_msi_init(Object *obj)
{
LoongArchPCHMSI *s = LOONGARCH_PCH_MSI(obj);
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
memory_region_init_io(&s->msi_mmio, obj, &loongarch_pch_msi_ops,
s, TYPE_LOONGARCH_PCH_MSI, 0x8);
sysbus_init_mmio(sbd, &s->msi_mmio);
msi_nonbroken = true;
}
static const Property loongarch_msi_properties[] = {
DEFINE_PROP_UINT32("msi_irq_base", LoongArchPCHMSI, irq_base, 0),
DEFINE_PROP_UINT32("msi_irq_num", LoongArchPCHMSI, irq_num, 0),
};
static void loongarch_pch_msi_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = loongarch_pch_msi_realize;
dc->unrealize = loongarch_pch_msi_unrealize;
device_class_set_props(dc, loongarch_msi_properties);
}
static const TypeInfo loongarch_pch_msi_info = {
.name = TYPE_LOONGARCH_PCH_MSI,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(LoongArchPCHMSI),
.instance_init = loongarch_pch_msi_init,
.class_init = loongarch_pch_msi_class_init,
};
static void loongarch_pch_msi_register_types(void)
{
type_register_static(&loongarch_pch_msi_info);
}
type_init(loongarch_pch_msi_register_types)
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