[PATCH v4 1/9] hw/misc/aspeed_scu: Introduce Aspeed2700SCUState

[Jamin Lin <jamin_lin@aspeedtech.com>]

Introduce Aspeed2700SCUState as an AST2700-specific subclass of
AspeedSCUState.

Currently, AST1700 and AST2700 reuse the generic AspeedSCUState.
However, AST2700 requires SCU functionality that is specific to the
platform, particularly for interactions with its coprocessors.

Introduce a dedicated Aspeed2700SCUState to provide an extension point
for AST2700-specific functionality while keeping the generic
AspeedSCUState unchanged.

Subsequent patches will migrate AST2700 users to the new subclass and
move AST2700-specific code into it.

No functional change.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
---
 include/hw/misc/aspeed_scu.h | 5 +++++
 hw/misc/aspeed_scu.c         | 8 +++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/include/hw/misc/aspeed_scu.h b/include/hw/misc/aspeed_scu.h
index c30940ab76..904549465f 100644
--- a/include/hw/misc/aspeed_scu.h
+++ b/include/hw/misc/aspeed_scu.h
@@ -20,6 +20,7 @@ OBJECT_DECLARE_TYPE(AspeedSCUState, AspeedSCUClass, ASPEED_SCU)
 #define TYPE_ASPEED_2500_SCU TYPE_ASPEED_SCU "-ast2500"
 #define TYPE_ASPEED_2600_SCU TYPE_ASPEED_SCU "-ast2600"
 #define TYPE_ASPEED_2700_SCU TYPE_ASPEED_SCU "-ast2700"
+OBJECT_DECLARE_SIMPLE_TYPE(Aspeed2700SCUState, ASPEED_2700_SCU)
 #define TYPE_ASPEED_2700_SCUIO TYPE_ASPEED_SCU "io" "-ast2700"
 #define TYPE_ASPEED_1030_SCU TYPE_ASPEED_SCU "-ast1030"
 
@@ -41,6 +42,10 @@ struct AspeedSCUState {
     uint32_t hw_prot_key;
 };
 
+struct Aspeed2700SCUState {
+    AspeedSCUState parent_obj;
+};
+
 #define AST2400_A1_SILICON_REV   0x02010303U
 #define AST2500_A1_SILICON_REV   0x04010303U
 #define AST2600_A3_SILICON_REV   0x05030303U
diff --git a/hw/misc/aspeed_scu.c b/hw/misc/aspeed_scu.c
index 5dbf81c0ce..efe1d6315b 100644
--- a/hw/misc/aspeed_scu.c
+++ b/hw/misc/aspeed_scu.c
@@ -930,6 +930,11 @@ static void aspeed_ast2700_scu_reset_hold(Object *obj, ResetType type)
     s->regs[AST2700_HW_STRAP1] = s->hw_strap1;
 }
 
+static void aspeed_2700_scu_realize(DeviceState *dev, Error **errp)
+{
+    aspeed_scu_realize(dev, errp);
+}
+
 static void aspeed_2700_scu_class_init(ObjectClass *klass, const void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -937,6 +942,7 @@ static void aspeed_2700_scu_class_init(ObjectClass *klass, const void *data)
     AspeedSCUClass *asc = ASPEED_SCU_CLASS(klass);
 
     dc->desc = "ASPEED 2700 System Control Unit";
+    dc->realize = aspeed_2700_scu_realize;
     rc->phases.hold = aspeed_ast2700_scu_reset_hold;
     asc->resets = ast2700_a0_resets;
     asc->calc_hpll = aspeed_2600_scu_calc_hpll;
@@ -1161,7 +1167,7 @@ static const TypeInfo aspeed_scu_types[] = {
     {
         .name = TYPE_ASPEED_2700_SCU,
         .parent = TYPE_ASPEED_SCU,
-        .instance_size = sizeof(AspeedSCUState),
+        .instance_size = sizeof(Aspeed2700SCUState),
         .class_init = aspeed_2700_scu_class_init,
     },
     {
-- 
2.43.0