[PATCH v6 33/33] hw/isa/piix: Share PIIX3's base class with PIIX4

[Bernhard Beschow <shentey@gmail.com>]

Having a common base class will allow for substituting PIIX3 with PIIX4
and vice versa. Moreover, it makes PIIX4 implement the
acpi-dev-aml-interface.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20221022150508.26830-42-shentey@gmail.com>
---
 hw/isa/piix.c | 49 ++++++++++++++++++++++---------------------------
 1 file changed, 22 insertions(+), 27 deletions(-)

diff --git a/hw/isa/piix.c b/hw/isa/piix.c
index f125a6175f..54a1246a9d 100644
--- a/hw/isa/piix.c
+++ b/hw/isa/piix.c
@@ -396,13 +396,12 @@ static void build_pci_isa_aml(AcpiDevAmlIf *adev, Aml *scope)
     }
 }
 
-static void pci_piix3_init(Object *obj)
+static void pci_piix_init(Object *obj)
 {
     PIIXState *d = PIIX_PCI_DEVICE(obj);
 
     object_initialize_child(obj, "pic", &d->pic, TYPE_ISA_PIC);
     object_initialize_child(obj, "rtc", &d->rtc, TYPE_MC146818_RTC);
-    object_initialize_child(obj, "ide", &d->ide, TYPE_PIIX3_IDE);
 }
 
 static Property pci_piix_props[] = {
@@ -413,7 +412,7 @@ static Property pci_piix_props[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
-static void pci_piix3_class_init(ObjectClass *klass, void *data)
+static void pci_piix_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
@@ -421,11 +420,8 @@ static void pci_piix3_class_init(ObjectClass *klass, void *data)
 
     dc->reset       = piix_reset;
     dc->desc        = "ISA bridge";
-    dc->vmsd        = &vmstate_piix3;
     dc->hotpluggable   = false;
     k->vendor_id    = PCI_VENDOR_ID_INTEL;
-    /* 82371SB PIIX3 PCI-to-ISA bridge (Step A1) */
-    k->device_id    = PCI_DEVICE_ID_INTEL_82371SB_0;
     k->class_id     = PCI_CLASS_BRIDGE_ISA;
     /*
      * Reason: part of PIIX3 southbridge, needs to be wired up by
@@ -440,9 +436,9 @@ static const TypeInfo piix_pci_type_info = {
     .name = TYPE_PIIX_PCI_DEVICE,
     .parent = TYPE_PCI_DEVICE,
     .instance_size = sizeof(PIIXState),
-    .instance_init = pci_piix3_init,
+    .instance_init = pci_piix_init,
     .abstract = true,
-    .class_init = pci_piix3_class_init,
+    .class_init = pci_piix_class_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
         { TYPE_ACPI_DEV_AML_IF },
@@ -465,17 +461,29 @@ static void piix3_realize(PCIDevice *dev, Error **errp)
     pci_bus_set_route_irq_fn(pci_bus, piix3_route_intx_pin_to_irq);
 }
 
+static void piix3_init(Object *obj)
+{
+    PIIXState *d = PIIX_PCI_DEVICE(obj);
+
+    object_initialize_child(obj, "ide", &d->ide, TYPE_PIIX3_IDE);
+}
+
 static void piix3_class_init(ObjectClass *klass, void *data)
 {
+    DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
     k->config_write = piix_write_config;
     k->realize = piix3_realize;
+    /* 82371SB PIIX3 PCI-to-ISA bridge (Step A1) */
+    k->device_id = PCI_DEVICE_ID_INTEL_82371SB_0;
+    dc->vmsd = &vmstate_piix3;
 }
 
 static const TypeInfo piix3_info = {
     .name          = TYPE_PIIX3_DEVICE,
     .parent        = TYPE_PIIX_PCI_DEVICE,
+    .instance_init = piix3_init,
     .class_init    = piix3_class_init,
 };
 
@@ -501,15 +509,20 @@ static void piix3_xen_realize(PCIDevice *dev, Error **errp)
 
 static void piix3_xen_class_init(ObjectClass *klass, void *data)
 {
+    DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 
     k->config_write = piix3_write_config_xen;
     k->realize = piix3_xen_realize;
+    /* 82371SB PIIX3 PCI-to-ISA bridge (Step A1) */
+    k->device_id = PCI_DEVICE_ID_INTEL_82371SB_0;
+    dc->vmsd = &vmstate_piix3;
 }
 
 static const TypeInfo piix3_xen_info = {
     .name          = TYPE_PIIX3_XEN_DEVICE,
     .parent        = TYPE_PIIX_PCI_DEVICE,
+    .instance_init = piix3_init,
     .class_init    = piix3_xen_class_init,
 };
 
@@ -540,8 +553,6 @@ static void piix4_init(Object *obj)
 {
     PIIXState *s = PIIX_PCI_DEVICE(obj);
 
-    object_initialize_child(obj, "pic", &s->pic, TYPE_ISA_PIC);
-    object_initialize_child(obj, "rtc", &s->rtc, TYPE_MC146818_RTC);
     object_initialize_child(obj, "ide", &s->ide, TYPE_PIIX4_IDE);
 }
 
@@ -552,31 +563,15 @@ static void piix4_class_init(ObjectClass *klass, void *data)
 
     k->config_write = piix_write_config;
     k->realize = piix4_realize;
-    k->vendor_id = PCI_VENDOR_ID_INTEL;
     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_0;
-    k->class_id = PCI_CLASS_BRIDGE_ISA;
-    dc->reset = piix_reset;
-    dc->desc = "ISA bridge";
     dc->vmsd = &vmstate_piix4;
-    /*
-     * Reason: part of PIIX4 southbridge, needs to be wired up,
-     * e.g. by mips_malta_init()
-     */
-    dc->user_creatable = false;
-    dc->hotpluggable = false;
-    device_class_set_props(dc, pci_piix_props);
 }
 
 static const TypeInfo piix4_info = {
     .name          = TYPE_PIIX4_PCI_DEVICE,
-    .parent        = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(PIIXState),
+    .parent        = TYPE_PIIX_PCI_DEVICE,
     .instance_init = piix4_init,
     .class_init    = piix4_class_init,
-    .interfaces = (InterfaceInfo[]) {
-        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
-        { },
-    },
 };
 
 static void piix3_register_types(void)
-- 
2.39.0