piix4: QOMify

Signed-off-by: NGonglei <arei.gonglei@huawei.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

hw/isa/piix4.c

@@ -34,6 +34,10 @@ typedef struct PIIX4State {
     PCIDevice dev;
 } PIIX4State;
 
+#define TYPE_PIIX4_PCI_DEVICE "PIIX4"
+#define PIIX4_PCI_DEVICE(obj) \
+    OBJECT_CHECK(PIIX4State, (obj), TYPE_PIIX4_PCI_DEVICE)
+
 static void piix4_reset(void *opaque)
 {
     PIIX4State *d = opaque;
@@ -84,7 +88,7 @@ static const VMStateDescription vmstate_piix4 = {
 
 static void piix4_realize(PCIDevice *dev, Error **errp)
 {
-    PIIX4State *d = DO_UPCAST(PIIX4State, dev, dev);
+    PIIX4State *d = PIIX4_PCI_DEVICE(dev);
 
     isa_bus_new(DEVICE(d), pci_address_space(dev),
                 pci_address_space_io(dev));
@@ -121,7 +125,7 @@ static void piix4_class_init(ObjectClass *klass, void *data)
 }
 
 static const TypeInfo piix4_info = {
-    .name          = "PIIX4",
+    .name          = TYPE_PIIX4_PCI_DEVICE,
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(PIIX4State),
     .class_init    = piix4_class_init,