diff --git a/hw/usb/hcd-ehci-pci.c b/hw/usb/hcd-ehci-pci.c
index b352f73..509867d 100644
--- a/hw/usb/hcd-ehci-pci.c
+++ b/hw/usb/hcd-ehci-pci.c
@@ -60,20 +60,28 @@ static int usb_ehci_pci_initfn(PCIDevice *dev)
     pci_conf[0x6e] = 0x00;
     pci_conf[0x6f] = 0xc0;  /* USBLEFCTLSTS */
 
-    s->caps[0x09] = 0x68;        /* EECP */
-
     s->irq = dev->irq[3];
     s->as = pci_get_address_space(dev);
 
-    s->capsbase = 0x00;
-    s->opregbase = 0x20;
-
     usb_ehci_realize(s, DEVICE(dev), NULL);
     pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->mem);
 
     return 0;
 }
 
+static void usb_ehci_pci_init(Object *obj)
+{
+    EHCIPCIState *i = PCI_EHCI(obj);
+    EHCIState *s = &i->ehci;
+
+    s->caps[0x09] = 0x68;        /* EECP */
+
+    s->capsbase = 0x00;
+    s->opregbase = 0x20;
+
+    usb_ehci_init(s, DEVICE(obj));
+}
+
 static void usb_ehci_pci_write_config(PCIDevice *dev, uint32_t addr,
                                       uint32_t val, int l)
 {
@@ -122,6 +130,7 @@ static const TypeInfo ehci_pci_type_info = {
     .name = TYPE_PCI_EHCI,
     .parent = TYPE_PCI_DEVICE,
     .instance_size = sizeof(EHCIPCIState),
+    .instance_init = usb_ehci_pci_init,
     .abstract = true,
     .class_init = ehci_class_init,
 };
diff --git a/hw/usb/hcd-ehci-sysbus.c b/hw/usb/hcd-ehci-sysbus.c
index 3179e6f..e450137 100644
--- a/hw/usb/hcd-ehci-sysbus.c
+++ b/hw/usb/hcd-ehci-sysbus.c
@@ -36,15 +36,24 @@ static void usb_ehci_sysbus_realize(DeviceState *dev, Error **errp)
 {
     SysBusDevice *d = SYS_BUS_DEVICE(dev);
     EHCISysBusState *i = SYS_BUS_EHCI(dev);
-    SysBusEHCIClass *sec = SYS_BUS_EHCI_GET_CLASS(dev);
+    EHCIState *s = &i->ehci;
+
+    usb_ehci_realize(s, dev, errp);
+    sysbus_init_irq(d, &s->irq);
+}
+
+static void ehci_sysbus_init(Object *obj)
+{
+    SysBusDevice *d = SYS_BUS_DEVICE(obj);
+    EHCISysBusState *i = SYS_BUS_EHCI(obj);
+    SysBusEHCIClass *sec = SYS_BUS_EHCI_GET_CLASS(obj);
     EHCIState *s = &i->ehci;
 
     s->capsbase = sec->capsbase;
     s->opregbase = sec->opregbase;
     s->as = &address_space_memory;
 
-    usb_ehci_realize(s, dev, errp);
-    sysbus_init_irq(d, &s->irq);
+    usb_ehci_init(s, DEVICE(obj));
     sysbus_init_mmio(d, &s->mem);
 }
 
@@ -61,6 +70,7 @@ static const TypeInfo ehci_type_info = {
     .name          = TYPE_SYS_BUS_EHCI,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(EHCISysBusState),
+    .instance_init = ehci_sysbus_init,
     .abstract      = true,
     .class_init    = ehci_sysbus_class_init,
     .class_size    = sizeof(SysBusEHCIClass),
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index ea0379b..546032a 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -2512,6 +2512,22 @@ void usb_ehci_realize(EHCIState *s, DeviceState *dev, Error **errp)
 {
     int i;
 
+    usb_bus_new(&s->bus, &ehci_bus_ops, dev);
+    for (i = 0; i < NB_PORTS; i++) {
+        usb_register_port(&s->bus, &s->ports[i], s, i, &ehci_port_ops,
+                          USB_SPEED_MASK_HIGH);
+        s->ports[i].dev = 0;
+    }
+
+    s->frame_timer = qemu_new_timer_ns(vm_clock, ehci_frame_timer, s);
+    s->async_bh = qemu_bh_new(ehci_frame_timer, s);
+
+    qemu_register_reset(ehci_reset, s);
+    qemu_add_vm_change_state_handler(usb_ehci_vm_state_change, s);
+}
+
+void usb_ehci_init(EHCIState *s, DeviceState *dev)
+{
     /* 2.2 host controller interface version */
     s->caps[0x00] = (uint8_t)(s->opregbase - s->capsbase);
     s->caps[0x01] = 0x00;
@@ -2525,22 +2541,10 @@ void usb_ehci_realize(EHCIState *s, DeviceState *dev, Error **errp)
     s->caps[0x0a] = 0x00;
     s->caps[0x0b] = 0x00;
 
-    usb_bus_new(&s->bus, &ehci_bus_ops, dev);
-    for(i = 0; i < NB_PORTS; i++) {
-        usb_register_port(&s->bus, &s->ports[i], s, i, &ehci_port_ops,
-                          USB_SPEED_MASK_HIGH);
-        s->ports[i].dev = 0;
-    }
-
-    s->frame_timer = qemu_new_timer_ns(vm_clock, ehci_frame_timer, s);
-    s->async_bh = qemu_bh_new(ehci_frame_timer, s);
     QTAILQ_INIT(&s->aqueues);
     QTAILQ_INIT(&s->pqueues);
     usb_packet_init(&s->ipacket);
 
-    qemu_register_reset(ehci_reset, s);
-    qemu_add_vm_change_state_handler(usb_ehci_vm_state_change, s);
-
     memory_region_init(&s->mem, "ehci", MMIO_SIZE);
     memory_region_init_io(&s->mem_caps, &ehci_mmio_caps_ops, s,
                           "capabilities", CAPA_SIZE);
diff --git a/hw/usb/hcd-ehci.h b/hw/usb/hcd-ehci.h
index 15c7630..7a93957 100644
--- a/hw/usb/hcd-ehci.h
+++ b/hw/usb/hcd-ehci.h
@@ -322,6 +322,7 @@ struct EHCIState {
 
 extern const VMStateDescription vmstate_ehci;
 
+void usb_ehci_init(EHCIState *s, DeviceState *dev);
 void usb_ehci_realize(EHCIState *s, DeviceState *dev, Error **errp);
 
 #define TYPE_PCI_EHCI "pci-ehci-usb"
