hw/arm/aspeed_ast27x0-tsp: Make AST27x0 TSP inherit from AspeedCoprocessor instead of AspeedSoC

Refactor the AST27x0 TSP implementation to derive from the newly introduced
AspeedCoprocessor base class rather than AspeedSoC. The AspeedSoC class
includes SoC-level infrastructure and peripheral definitions that are not
applicable to lightweight coprocessor subsystems such as TSP, resulting in
unnecessary coupling and complexity.

This change moves the Aspeed27x0TSPSoCState structure definition into
aspeed_coprocessor.h and updates all related references in
aspeed_ast27x0-tsp.c and aspeed_ast27x0-fc.c to use
AspeedCoprocessorState and AspeedCoprocessorClass.

Key updates include:

- Replace inheritance from AspeedSoC -> AspeedCoprocessor.
- Update type casts and macros from ASPEED_SOC_* to ASPEED_COPROCESSOR_*

This refactor improves modularity, reduces memory footprint, and prepares
for future coprocessor variants to share a lighter-weight common base.

No functional change.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20251013054334.955331-12-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

hw/arm/aspeed_ast27x0-fc.c

@@ -142,8 +142,8 @@ static bool ast2700fc_ssp_init(MachineState *machine, Error **errp)
 
 static bool ast2700fc_tsp_init(MachineState *machine, Error **errp)
 {
-    AspeedSoCState *soc;
-    AspeedSoCClass *sc;
+    AspeedCoprocessorState *soc;
+    AspeedCoprocessorClass *sc;
     Ast2700FCState *s = AST2700A1FC(machine);
     s->tsp_sysclk = clock_new(OBJECT(s), "TSP_SYSCLK");
     clock_set_hz(s->tsp_sysclk, 200000000ULL);
@@ -156,8 +156,8 @@ static bool ast2700fc_tsp_init(MachineState *machine, Error **errp)
     object_property_set_link(OBJECT(&s->tsp), "memory",
                              OBJECT(&s->tsp_memory), &error_abort);
 
-    soc = ASPEED_SOC(&s->tsp);
-    sc = ASPEED_SOC_GET_CLASS(soc);
+    soc = ASPEED_COPROCESSOR(&s->tsp);
+    sc = ASPEED_COPROCESSOR_GET_CLASS(soc);
     aspeed_soc_uart_set_chr(soc->uart, ASPEED_DEV_UART7, sc->uarts_base,
                             sc->uarts_num, serial_hd(2));
     if (!qdev_realize(DEVICE(&s->tsp), NULL, errp)) {

hw/arm/aspeed_ast27x0-tsp.c

@@ -14,6 +14,7 @@
 #include "hw/qdev-clock.h"
 #include "hw/misc/unimp.h"
 #include "hw/arm/aspeed_soc.h"
+#include "hw/arm/aspeed_coprocessor.h"
 
 #define AST2700_TSP_RAM_SIZE (32 * MiB)
 
@@ -104,10 +105,11 @@ static struct nvic_intc_irq_info ast2700_tsp_intcmap[] = {
     {136, 0, 9, NULL},
 };
 
-static qemu_irq aspeed_soc_ast27x0tsp_get_irq(AspeedSoCState *s, int dev)
+static qemu_irq aspeed_soc_ast27x0tsp_get_irq(AspeedCoprocessorState *s,
+                                              int dev)
 {
     Aspeed27x0TSPSoCState *a = ASPEED27X0TSP_SOC(s);
-    AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
+    AspeedCoprocessorClass *sc = ASPEED_COPROCESSOR_GET_CLASS(s);
 
     int or_idx;
     int idx;
@@ -129,8 +131,8 @@ static qemu_irq aspeed_soc_ast27x0tsp_get_irq(AspeedSoCState *s, int dev)
 static void aspeed_soc_ast27x0tsp_init(Object *obj)
 {
     Aspeed27x0TSPSoCState *a = ASPEED27X0TSP_SOC(obj);
-    AspeedSoCState *s = ASPEED_SOC(obj);
-    AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
+    AspeedCoprocessorState *s = ASPEED_COPROCESSOR(obj);
+    AspeedCoprocessorClass *sc = ASPEED_COPROCESSOR_GET_CLASS(s);
     int i;
 
     object_initialize_child(obj, "armv7m", &a->armv7m, TYPE_ARMV7M);
@@ -160,8 +162,8 @@ static void aspeed_soc_ast27x0tsp_init(Object *obj)
 static void aspeed_soc_ast27x0tsp_realize(DeviceState *dev_soc, Error **errp)
 {
     Aspeed27x0TSPSoCState *a = ASPEED27X0TSP_SOC(dev_soc);
-    AspeedSoCState *s = ASPEED_SOC(dev_soc);
-    AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
+    AspeedCoprocessorState *s = ASPEED_COPROCESSOR(dev_soc);
+    AspeedCoprocessorClass *sc = ASPEED_COPROCESSOR_GET_CLASS(s);
     DeviceState *armv7m;
     g_autofree char *sram_name = NULL;
     int uart;
@@ -185,8 +187,8 @@ static void aspeed_soc_ast27x0tsp_realize(DeviceState *dev_soc, Error **errp)
     sram_name = g_strdup_printf("aspeed.dram.%d",
                                 CPU(a->armv7m.cpu)->cpu_index);
 
-    if (!memory_region_init_ram(&s->sram, OBJECT(s), sram_name, sc->sram_size,
-                                errp)) {
+    if (!memory_region_init_ram(&s->sram, OBJECT(s), sram_name,
+                                AST2700_TSP_RAM_SIZE, errp)) {
         return;
     }
     memory_region_add_subregion(s->memory,
@@ -268,30 +270,24 @@ static void aspeed_soc_ast27x0tsp_class_init(ObjectClass *klass, const void *dat
         NULL
     };
     DeviceClass *dc = DEVICE_CLASS(klass);
-    AspeedSoCClass *sc = ASPEED_SOC_CLASS(dc);
+    AspeedCoprocessorClass *sc = ASPEED_COPROCESSOR_CLASS(dc);
 
-    /* Reason: The Aspeed SoC can only be instantiated from a board */
+    /* Reason: The Aspeed Coprocessor can only be instantiated from a board */
     dc->user_creatable = false;
     dc->realize = aspeed_soc_ast27x0tsp_realize;
 
     sc->valid_cpu_types = valid_cpu_types;
     sc->silicon_rev = AST2700_A1_SILICON_REV;
-    sc->sram_size = AST2700_TSP_RAM_SIZE;
-    sc->spis_num = 0;
-    sc->ehcis_num = 0;
-    sc->wdts_num = 0;
-    sc->macs_num = 0;
     sc->uarts_num = 13;
     sc->uarts_base = ASPEED_DEV_UART0;
     sc->irqmap = aspeed_soc_ast27x0tsp_irqmap;
     sc->memmap = aspeed_soc_ast27x0tsp_memmap;
-    sc->num_cpus = 1;
 }
 
 static const TypeInfo aspeed_soc_ast27x0tsp_types[] = {
     {
         .name           = TYPE_ASPEED27X0TSP_SOC,
-        .parent         = TYPE_ASPEED_SOC,
+        .parent         = TYPE_ASPEED_COPROCESSOR,
         .instance_size  = sizeof(Aspeed27x0TSPSoCState),
         .instance_init  = aspeed_soc_ast27x0tsp_init,
         .class_init     = aspeed_soc_ast27x0tsp_class_init,

hw/arm/meson.build

@@ -45,7 +45,6 @@ arm_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files(
   'aspeed_soc_common.c',
   'aspeed_ast2400.c',
   'aspeed_ast2600.c',
-  'aspeed_ast27x0-tsp.c',
   'aspeed_ast10x0.c',
   'aspeed_eeprom.c',
   'fby35.c'))
@@ -53,6 +52,7 @@ arm_common_ss.add(when: ['CONFIG_ASPEED_SOC', 'TARGET_AARCH64'], if_true: files(
   'aspeed_ast27x0.c',
   'aspeed_ast27x0-fc.c',
   'aspeed_ast27x0-ssp.c',
+  'aspeed_ast27x0-tsp.c',
   'aspeed_coprocessor_common.c'))
 arm_common_ss.add(when: 'CONFIG_MPS2', if_true: files('mps2.c'))
 arm_common_ss.add(when: 'CONFIG_MPS2', if_true: files('mps2-tz.c'))

include/hw/arm/aspeed_coprocessor.h

@@ -53,4 +53,16 @@ struct Aspeed27x0SSPSoCState {
 #define TYPE_ASPEED27X0SSP_SOC "aspeed27x0ssp-soc"
 OBJECT_DECLARE_SIMPLE_TYPE(Aspeed27x0SSPSoCState, ASPEED27X0SSP_SOC)
 
+struct Aspeed27x0TSPSoCState {
+    AspeedCoprocessorState parent;
+    AspeedINTCState intc[2];
+    UnimplementedDeviceState ipc[2];
+    UnimplementedDeviceState scuio;
+
+    ARMv7MState armv7m;
+};
+
+#define TYPE_ASPEED27X0TSP_SOC "aspeed27x0tsp-soc"
+OBJECT_DECLARE_SIMPLE_TYPE(Aspeed27x0TSPSoCState, ASPEED27X0TSP_SOC)
+
 #endif /* ASPEED_COPROCESSOR_H */

include/hw/arm/aspeed_soc.h

@@ -153,18 +153,6 @@ struct Aspeed10x0SoCState {
     ARMv7MState armv7m;
 };
 
-struct Aspeed27x0TSPSoCState {
-    AspeedSoCState parent;
-    AspeedINTCState intc[2];
-    UnimplementedDeviceState ipc[2];
-    UnimplementedDeviceState scuio;
-
-    ARMv7MState armv7m;
-};
-
-#define TYPE_ASPEED27X0TSP_SOC "aspeed27x0tsp-soc"
-OBJECT_DECLARE_SIMPLE_TYPE(Aspeed27x0TSPSoCState, ASPEED27X0TSP_SOC)
-
 #define TYPE_ASPEED10X0_SOC "aspeed10x0-soc"
 OBJECT_DECLARE_SIMPLE_TYPE(Aspeed10x0SoCState, ASPEED10X0_SOC)