[PATCH v4 3/9] hw/arm/aspeed_ast27x0: Move SCU link into AST27x0 coprocessors

The SCU link is only needed by the AST27x0 SSP/TSP coprocessors for their
AST2700-specific SCU alias window.

Move the link property from the common AspeedCoprocessorState into
Aspeed27x0CoprocessorState, so the generic coprocessor model no longer
contains an AST2700-specific dependency.

Also validate that the SCU link has been provided during device realize
before accessing it.

No functional change.

Signed-off-by: Jamin Lin <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Cédric Le Goater <[email protected]>
Tested-by: Philippe Mathieu-Daudé <[email protected]>
---
 include/hw/arm/aspeed_coprocessor.h |  5 +++--
 hw/arm/aspeed_ast27x0-ssp.c         | 20 ++++++++++++++++----
 hw/arm/aspeed_ast27x0-tsp.c         | 20 ++++++++++++++++----
 hw/arm/aspeed_coprocessor_common.c  |  2 --
 4 files changed, 35 insertions(+), 12 deletions(-)

diff --git a/include/hw/arm/aspeed_coprocessor.h b/include/hw/arm/aspeed_coprocessor.h
index ac58a5f424..adfc3c4512 100644
--- a/include/hw/arm/aspeed_coprocessor.h
+++ b/include/hw/arm/aspeed_coprocessor.h
@@ -20,10 +20,8 @@ struct AspeedCoprocessorState {
     MemoryRegion *sram;
     MemoryRegion sram_alias;
     MemoryRegion uart_alias;
-    MemoryRegion scu_alias;
     Clock *sysclk;
 
-    AspeedSCUState *scu;
     AspeedSCUState scuio;
     AspeedTimerCtrlState timerctrl;
     SerialMM *uart;
@@ -52,6 +50,9 @@ struct Aspeed27x0CoprocessorState {
     UnimplementedDeviceState otp;
 
     ARMv7MState armv7m;
+
+    MemoryRegion scu_alias;
+    Aspeed2700SCUState *scu;
 };
 
 #define TYPE_ASPEED27X0SSP_COPROCESSOR "aspeed27x0ssp-coprocessor"
diff --git a/hw/arm/aspeed_ast27x0-ssp.c b/hw/arm/aspeed_ast27x0-ssp.c
index 68a8ab26f7..28bb59c8c5 100644
--- a/hw/arm/aspeed_ast27x0-ssp.c
+++ b/hw/arm/aspeed_ast27x0-ssp.c
@@ -167,6 +167,12 @@ static void aspeed_soc_ast27x0ssp_realize(DeviceState *dev_soc, Error **errp)
         return;
     }
 
+    if (!a->scu) {
+        error_setg(errp, TYPE_ASPEED27X0SSP_COPROCESSOR
+                   ": 'scu' link is not set");
+        return;
+    }
+
     /* AST27X0 SSP Core */
     armv7m = DEVICE(&a->armv7m);
     qdev_prop_set_uint32(armv7m, "num-irq", 256);
@@ -195,11 +201,11 @@ static void aspeed_soc_ast27x0ssp_realize(DeviceState *dev_soc, Error **errp)
                                 &s->sram_alias);
 
     /* SCU */
-    memory_region_init_alias(&s->scu_alias, OBJECT(s), "scu.alias",
-                             &s->scu->iomem, 0,
-                             memory_region_size(&s->scu->iomem));
+    memory_region_init_alias(&a->scu_alias, OBJECT(a), "scu.alias",
+                             &a->scu->parent_obj.iomem, 0,
+                             memory_region_size(&a->scu->parent_obj.iomem));
     memory_region_add_subregion(s->memory, sc->memmap[ASPEED_DEV_SCU],
-                                &s->scu_alias);
+                                &a->scu_alias);
 
     /* INTC */
     if (!sysbus_realize(SYS_BUS_DEVICE(&a->intc[0]), errp)) {
@@ -275,6 +281,11 @@ static void aspeed_soc_ast27x0ssp_realize(DeviceState *dev_soc, Error **errp)
                                   sc->memmap[ASPEED_DEV_OTP], 0x800);
 }
 
+static const Property aspeed_27x0_coprocessor_properties[] = {
+    DEFINE_PROP_LINK("scu", Aspeed27x0CoprocessorState, scu,
+                     TYPE_ASPEED_2700_SCU, Aspeed2700SCUState *),
+};
+
 static void aspeed_soc_ast27x0ssp_class_init(ObjectClass *klass,
                                              const void *data)
 {
@@ -288,6 +299,7 @@ static void aspeed_soc_ast27x0ssp_class_init(ObjectClass *klass,
     /* Reason: The Aspeed Coprocessor can only be instantiated from a board */
     dc->user_creatable = false;
     dc->realize = aspeed_soc_ast27x0ssp_realize;
+    device_class_set_props(dc, aspeed_27x0_coprocessor_properties);
 
     sc->valid_cpu_types = valid_cpu_types;
     sc->irqmap = aspeed_soc_ast27x0ssp_irqmap;
diff --git a/hw/arm/aspeed_ast27x0-tsp.c b/hw/arm/aspeed_ast27x0-tsp.c
index b8a4f7c91d..f5c4a02161 100644
--- a/hw/arm/aspeed_ast27x0-tsp.c
+++ b/hw/arm/aspeed_ast27x0-tsp.c
@@ -167,6 +167,12 @@ static void aspeed_soc_ast27x0tsp_realize(DeviceState *dev_soc, Error **errp)
         return;
     }
 
+    if (!a->scu) {
+        error_setg(errp, TYPE_ASPEED27X0TSP_COPROCESSOR
+                   ": 'scu' link is not set");
+        return;
+    }
+
     /* AST27X0 TSP Core */
     armv7m = DEVICE(&a->armv7m);
     qdev_prop_set_uint32(armv7m, "num-irq", 256);
@@ -195,11 +201,11 @@ static void aspeed_soc_ast27x0tsp_realize(DeviceState *dev_soc, Error **errp)
                                 &s->sram_alias);
 
     /* SCU */
-    memory_region_init_alias(&s->scu_alias, OBJECT(s), "scu.alias",
-                             &s->scu->iomem, 0,
-                             memory_region_size(&s->scu->iomem));
+    memory_region_init_alias(&a->scu_alias, OBJECT(a), "scu.alias",
+                             &a->scu->parent_obj.iomem, 0,
+                             memory_region_size(&a->scu->parent_obj.iomem));
     memory_region_add_subregion(s->memory, sc->memmap[ASPEED_DEV_SCU],
-                                &s->scu_alias);
+                                &a->scu_alias);
 
     /* INTC */
     if (!sysbus_realize(SYS_BUS_DEVICE(&a->intc[0]), errp)) {
@@ -275,6 +281,11 @@ static void aspeed_soc_ast27x0tsp_realize(DeviceState *dev_soc, Error **errp)
                                   sc->memmap[ASPEED_DEV_OTP], 0x800);
 }
 
+static const Property aspeed_27x0_coprocessor_properties[] = {
+    DEFINE_PROP_LINK("scu", Aspeed27x0CoprocessorState, scu,
+                     TYPE_ASPEED_2700_SCU, Aspeed2700SCUState *),
+};
+
 static void aspeed_soc_ast27x0tsp_class_init(ObjectClass *klass,
                                              const void *data)
 {
@@ -288,6 +299,7 @@ static void aspeed_soc_ast27x0tsp_class_init(ObjectClass *klass,
     /* Reason: The Aspeed Coprocessor can only be instantiated from a board */
     dc->user_creatable = false;
     dc->realize = aspeed_soc_ast27x0tsp_realize;
+    device_class_set_props(dc, aspeed_27x0_coprocessor_properties);
 
     sc->valid_cpu_types = valid_cpu_types;
     sc->irqmap = aspeed_soc_ast27x0tsp_irqmap;
diff --git a/hw/arm/aspeed_coprocessor_common.c b/hw/arm/aspeed_coprocessor_common.c
index a0a4c73d08..43026d2a55 100644
--- a/hw/arm/aspeed_coprocessor_common.c
+++ b/hw/arm/aspeed_coprocessor_common.c
@@ -27,8 +27,6 @@ static const Property aspeed_coprocessor_properties[] = {
                      TYPE_MEMORY_REGION, MemoryRegion *),
     DEFINE_PROP_LINK("sram", AspeedCoprocessorState, sram, TYPE_MEMORY_REGION,
                      MemoryRegion *),
-    DEFINE_PROP_LINK("scu", AspeedCoprocessorState, scu, TYPE_ASPEED_SCU,
-                     AspeedSCUState *),
     DEFINE_PROP_LINK("uart", AspeedCoprocessorState, uart, TYPE_SERIAL_MM,
                      SerialMM *),
     DEFINE_PROP_INT32("uart-dev", AspeedCoprocessorState, uart_dev, 0),
-- 
2.43.0