target/nios2: Convert to 3-phase reset

Convert the nios2 CPU class to use 3-phase reset, so it doesn't
need to use device_class_set_parent_reset() any more.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Edgar E. Iglesias <edgar@zeroasic.com>
Reviewed-by: Taylor Simpson <tsimpson@quicinc.com>
Message-id: 20221124115023.2437291-12-peter.maydell@linaro.org

target/nios2/cpu.c

@@ -57,14 +57,16 @@ static bool nios2_cpu_has_work(CPUState *cs)
     return cs->interrupt_request & CPU_INTERRUPT_HARD;
 }
 
-static void nios2_cpu_reset(DeviceState *dev)
+static void nios2_cpu_reset_hold(Object *obj)
 {
-    CPUState *cs = CPU(dev);
+    CPUState *cs = CPU(obj);
     Nios2CPU *cpu = NIOS2_CPU(cs);
     Nios2CPUClass *ncc = NIOS2_CPU_GET_CLASS(cpu);
     CPUNios2State *env = &cpu->env;
 
-    ncc->parent_reset(dev);
+    if (ncc->parent_phases.hold) {
+        ncc->parent_phases.hold(obj);
+    }
 
     memset(env->ctrl, 0, sizeof(env->ctrl));
     env->pc = cpu->reset_addr;
@@ -371,11 +373,13 @@ static void nios2_cpu_class_init(ObjectClass *oc, void *data)
     DeviceClass *dc = DEVICE_CLASS(oc);
     CPUClass *cc = CPU_CLASS(oc);
     Nios2CPUClass *ncc = NIOS2_CPU_CLASS(oc);
+    ResettableClass *rc = RESETTABLE_CLASS(oc);
 
     device_class_set_parent_realize(dc, nios2_cpu_realizefn,
                                     &ncc->parent_realize);
     device_class_set_props(dc, nios2_properties);
-    device_class_set_parent_reset(dc, nios2_cpu_reset, &ncc->parent_reset);
+    resettable_class_set_parent_phases(rc, NULL, nios2_cpu_reset_hold, NULL,
+                                       &ncc->parent_phases);
 
     cc->class_by_name = nios2_cpu_class_by_name;
     cc->has_work = nios2_cpu_has_work;

target/nios2/cpu.h

@@ -37,7 +37,7 @@ OBJECT_DECLARE_CPU_TYPE(Nios2CPU, Nios2CPUClass, NIOS2_CPU)
 
 /**
  * Nios2CPUClass:
- * @parent_reset: The parent class' reset handler.
+ * @parent_phases: The parent class' reset phase handlers.
  *
  * A Nios2 CPU model.
  */
@@ -47,7 +47,7 @@ struct Nios2CPUClass {
     /*< public >*/
 
     DeviceRealize parent_realize;
-    DeviceReset parent_reset;
+    ResettablePhases parent_phases;
 };
 
 #define TARGET_HAS_ICE 1