hw/arm/stm32f405: Report error when incorrect CPU is used

Both 'netduinoplus2' and 'olimex-stm32-h405' machines ignore the
CPU type requested by the command line. This might confuse users,
since the following will create a machine with a Cortex-M4 CPU:

  $ qemu-system-aarch64 -M netduinoplus2 -cpu cortex-r5f

Set the MachineClass::valid_cpu_types field (introduced in commit
c9cf636d48 "machine: Add a valid_cpu_types property").
Remove the now unused MachineClass::default_cpu_type field.

We now get:

  $ qemu-system-aarch64 -M netduinoplus2 -cpu cortex-r5f
  qemu-system-aarch64: Invalid CPU type: cortex-r5f-arm-cpu
  The valid types are: cortex-m4-arm-cpu

Since the SoC family can only use Cortex-M4 CPUs, hard-code the
CPU type name at the SoC level, removing the QOM property
entirely.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Message-id: 20231117071704.35040-3-philmd@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/netduinoplus2.c

@@ -44,7 +44,6 @@ static void netduinoplus2_init(MachineState *machine)
     clock_set_hz(sysclk, SYSCLK_FRQ);
 
     dev = qdev_new(TYPE_STM32F405_SOC);
-    qdev_prop_set_string(dev, "cpu-type", ARM_CPU_TYPE_NAME("cortex-m4"));
     qdev_connect_clock_in(dev, "sysclk", sysclk);
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
 
@@ -55,8 +54,14 @@ static void netduinoplus2_init(MachineState *machine)
 
 static void netduinoplus2_machine_init(MachineClass *mc)
 {
+    static const char * const valid_cpu_types[] = {
+        ARM_CPU_TYPE_NAME("cortex-m4"),
+        NULL
+    };
+
     mc->desc = "Netduino Plus 2 Machine (Cortex-M4)";
     mc->init = netduinoplus2_init;
+    mc->valid_cpu_types = valid_cpu_types;
 }
 
 DEFINE_MACHINE("netduinoplus2", netduinoplus2_machine_init)

hw/arm/olimex-stm32-h405.c

@@ -47,7 +47,6 @@ static void olimex_stm32_h405_init(MachineState *machine)
     clock_set_hz(sysclk, SYSCLK_FRQ);
 
     dev = qdev_new(TYPE_STM32F405_SOC);
-    qdev_prop_set_string(dev, "cpu-type", ARM_CPU_TYPE_NAME("cortex-m4"));
     qdev_connect_clock_in(dev, "sysclk", sysclk);
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
 
@@ -58,9 +57,14 @@ static void olimex_stm32_h405_init(MachineState *machine)
 
 static void olimex_stm32_h405_machine_init(MachineClass *mc)
 {
+    static const char * const valid_cpu_types[] = {
+        ARM_CPU_TYPE_NAME("cortex-m4"),
+        NULL
+    };
+
     mc->desc = "Olimex STM32-H405 (Cortex-M4)";
     mc->init = olimex_stm32_h405_init;
-    mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-m4");
+    mc->valid_cpu_types = valid_cpu_types;
 
     /* SRAM pre-allocated as part of the SoC instantiation */
     mc->default_ram_size = 0;

hw/arm/stm32f405_soc.c

@@ -149,7 +149,7 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp)
 
     armv7m = DEVICE(&s->armv7m);
     qdev_prop_set_uint32(armv7m, "num-irq", 96);
-    qdev_prop_set_string(armv7m, "cpu-type", s->cpu_type);
+    qdev_prop_set_string(armv7m, "cpu-type", ARM_CPU_TYPE_NAME("cortex-m4"));
     qdev_prop_set_bit(armv7m, "enable-bitband", true);
     qdev_connect_clock_in(armv7m, "cpuclk", s->sysclk);
     qdev_connect_clock_in(armv7m, "refclk", s->refclk);
@@ -287,17 +287,11 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp)
     create_unimplemented_device("RNG",         0x50060800, 0x400);
 }
 
-static Property stm32f405_soc_properties[] = {
-    DEFINE_PROP_STRING("cpu-type", STM32F405State, cpu_type),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
 static void stm32f405_soc_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->realize = stm32f405_soc_realize;
-    device_class_set_props(dc, stm32f405_soc_properties);
     /* No vmstate or reset required: device has no internal state */
 }
 

include/hw/arm/stm32f405_soc.h

@@ -51,11 +51,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(STM32F405State, STM32F405_SOC)
 #define CCM_SIZE (64 * 1024)
 
 struct STM32F405State {
-    /*< private >*/
     SysBusDevice parent_obj;
-    /*< public >*/
-
-    char *cpu_type;
 
     ARMv7MState armv7m;