vt82c686: Introduce abstract TYPE_VIA_ISA and base vt82c686b_isa on it

To allow reusing ISA bridge emulation for vt8231_isa move the device
state of vt82c686b_isa emulation in an abstract via_isa class. This
change breaks migration back compatibility but this is not an issue
for Fuloong2E machine which is not versioned or migration supported.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <0cb8fc69c7aaa555589181931b881335fecd2ef3.1616680239.git.balaton@eik.bme.hu>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/isa/vt82c686.c

@@ -534,24 +534,48 @@ static const TypeInfo vt8231_superio_info = {
 };
 
 
-OBJECT_DECLARE_SIMPLE_TYPE(VT82C686BISAState, VT82C686B_ISA)
+#define TYPE_VIA_ISA "via-isa"
+OBJECT_DECLARE_SIMPLE_TYPE(ViaISAState, VIA_ISA)
 
-struct VT82C686BISAState {
+struct ViaISAState {
     PCIDevice dev;
     qemu_irq cpu_intr;
     ViaSuperIOState *via_sio;
 };
 
+static const VMStateDescription vmstate_via = {
+    .name = "via-isa",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_PCI_DEVICE(dev, ViaISAState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static const TypeInfo via_isa_info = {
+    .name          = TYPE_VIA_ISA,
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(ViaISAState),
+    .abstract      = true,
+    .interfaces    = (InterfaceInfo[]) {
+        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
+        { },
+    },
+};
+
 static void via_isa_request_i8259_irq(void *opaque, int irq, int level)
 {
-    VT82C686BISAState *s = opaque;
+    ViaISAState *s = opaque;
     qemu_set_irq(s->cpu_intr, level);
 }
 
+/* TYPE_VT82C686B_ISA */
+
 static void vt82c686b_write_config(PCIDevice *d, uint32_t addr,
                                    uint32_t val, int len)
 {
-    VT82C686BISAState *s = VT82C686B_ISA(d);
+    ViaISAState *s = VIA_ISA(d);
 
     trace_via_isa_write(addr, val, len);
     pci_default_write_config(d, addr, val, len);
@@ -561,19 +585,9 @@ static void vt82c686b_write_config(PCIDevice *d, uint32_t addr,
     }
 }
 
-static const VMStateDescription vmstate_via = {
-    .name = "vt82c686b",
-    .version_id = 1,
-    .minimum_version_id = 1,
-    .fields = (VMStateField[]) {
-        VMSTATE_PCI_DEVICE(dev, VT82C686BISAState),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
 static void vt82c686b_isa_reset(DeviceState *dev)
 {
-    VT82C686BISAState *s = VT82C686B_ISA(dev);
+    ViaISAState *s = VIA_ISA(dev);
     uint8_t *pci_conf = s->dev.config;
 
     pci_set_long(pci_conf + PCI_CAPABILITY_LIST, 0x000000c0);
@@ -593,7 +607,7 @@ static void vt82c686b_isa_reset(DeviceState *dev)
 
 static void vt82c686b_realize(PCIDevice *d, Error **errp)
 {
-    VT82C686BISAState *s = VT82C686B_ISA(d);
+    ViaISAState *s = VIA_ISA(d);
     DeviceState *dev = DEVICE(d);
     ISABus *isa_bus;
     qemu_irq *isa_irq;
@@ -617,7 +631,7 @@ static void vt82c686b_realize(PCIDevice *d, Error **errp)
     }
 }
 
-static void via_class_init(ObjectClass *klass, void *data)
+static void vt82c686b_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
@@ -625,28 +639,21 @@ static void via_class_init(ObjectClass *klass, void *data)
     k->realize = vt82c686b_realize;
     k->config_write = vt82c686b_write_config;
     k->vendor_id = PCI_VENDOR_ID_VIA;
-    k->device_id = PCI_DEVICE_ID_VIA_ISA_BRIDGE;
+    k->device_id = PCI_DEVICE_ID_VIA_82C686B_ISA;
     k->class_id = PCI_CLASS_BRIDGE_ISA;
     k->revision = 0x40;
     dc->reset = vt82c686b_isa_reset;
     dc->desc = "ISA bridge";
     dc->vmsd = &vmstate_via;
-    /*
+    /* Reason: part of VIA VT82C686 southbridge, needs to be wired up */
-     * Reason: part of VIA VT82C686 southbridge, needs to be wired up,
-     * e.g. by mips_fuloong2e_init()
-     */
     dc->user_creatable = false;
 }
 
-static const TypeInfo via_info = {
+static const TypeInfo vt82c686b_isa_info = {
     .name          = TYPE_VT82C686B_ISA,
-    .parent        = TYPE_PCI_DEVICE,
+    .parent        = TYPE_VIA_ISA,
-    .instance_size = sizeof(VT82C686BISAState),
+    .instance_size = sizeof(ViaISAState),
-    .class_init    = via_class_init,
+    .class_init    = vt82c686b_class_init,
-    .interfaces = (InterfaceInfo[]) {
-        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
-        { },
-    },
 };
 
 
@@ -658,7 +665,8 @@ static void vt82c686b_register_types(void)
     type_register_static(&via_superio_info);
     type_register_static(&vt82c686b_superio_info);
     type_register_static(&vt8231_superio_info);
-    type_register_static(&via_info);
+    type_register_static(&via_isa_info);
+    type_register_static(&vt82c686b_isa_info);
 }
 
 type_init(vt82c686b_register_types)

include/hw/pci/pci_ids.h

@@ -204,7 +204,7 @@
 #define PCI_VENDOR_ID_XILINX             0x10ee
 
 #define PCI_VENDOR_ID_VIA                0x1106
-#define PCI_DEVICE_ID_VIA_ISA_BRIDGE     0x0686
+#define PCI_DEVICE_ID_VIA_82C686B_ISA    0x0686
 #define PCI_DEVICE_ID_VIA_IDE            0x0571
 #define PCI_DEVICE_ID_VIA_UHCI           0x3038
 #define PCI_DEVICE_ID_VIA_82C686B_PM     0x3057