[PATCH v3 10/16] hw/arm/aspeed_ast27x0-ssp: Make AST27x0 SSP inherit from AspeedCoprocessor instead of AspeedSoC

[Jamin Lin via <qemu-devel@nongnu.org>]

Refactor the AST27x0 SSP implementation to derive from the newly introduced
AspeedCoprocessor base class rather than AspeedSoC. The AspeedSoC class
contains many SoC-level fields and behaviors that are not applicable to
coprocessor subsystems like SSP, leading to unnecessary coupling and code size.

This change moves the Aspeed27x0SSPSoCState structure definition into
aspeed_coprocessor.h and updates related references in
aspeed_ast27x0-ssp.c and aspeed_ast27x0-fc.c to use
AspeedCoprocessorState and AspeedCoprocessorClass.

Key updates include:

- Replace inheritance from AspeedSoC -> AspeedCoprocessor.
- Replace type casts and class access macros (ASPEED_SOC_*) with
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>
---
 include/hw/arm/aspeed_coprocessor.h | 12 ++++++++++++
 include/hw/arm/aspeed_soc.h         | 12 ------------
 hw/arm/aspeed_ast27x0-fc.c          | 10 +++++-----
 hw/arm/aspeed_ast27x0-ssp.c         | 30 +++++++++++++----------------
 hw/arm/meson.build                  |  2 +-
 5 files changed, 31 insertions(+), 35 deletions(-)

diff --git a/include/hw/arm/aspeed_coprocessor.h b/include/hw/arm/aspeed_coprocessor.h
index 793c7b1f8b..901b8d8e24 100644
--- a/include/hw/arm/aspeed_coprocessor.h
+++ b/include/hw/arm/aspeed_coprocessor.h
@@ -41,4 +41,16 @@ struct AspeedCoprocessorClass {
     int uarts_num;
 };
 
+struct Aspeed27x0SSPSoCState {
+    AspeedCoprocessorState parent;
+    AspeedINTCState intc[2];
+    UnimplementedDeviceState ipc[2];
+    UnimplementedDeviceState scuio;
+
+    ARMv7MState armv7m;
+};
+
+#define TYPE_ASPEED27X0SSP_SOC "aspeed27x0ssp-soc"
+OBJECT_DECLARE_SIMPLE_TYPE(Aspeed27x0SSPSoCState, ASPEED27X0SSP_SOC)
+
 #endif /* ASPEED_COPROCESSOR_H */
diff --git a/include/hw/arm/aspeed_soc.h b/include/hw/arm/aspeed_soc.h
index 0e07c079f0..a34ab986a9 100644
--- a/include/hw/arm/aspeed_soc.h
+++ b/include/hw/arm/aspeed_soc.h
@@ -153,18 +153,6 @@ struct Aspeed10x0SoCState {
     ARMv7MState armv7m;
 };
 
-struct Aspeed27x0SSPSoCState {
-    AspeedSoCState parent;
-    AspeedINTCState intc[2];
-    UnimplementedDeviceState ipc[2];
-    UnimplementedDeviceState scuio;
-
-    ARMv7MState armv7m;
-};
-
-#define TYPE_ASPEED27X0SSP_SOC "aspeed27x0ssp-soc"
-OBJECT_DECLARE_SIMPLE_TYPE(Aspeed27x0SSPSoCState, ASPEED27X0SSP_SOC)
-
 struct Aspeed27x0TSPSoCState {
     AspeedSoCState parent;
     AspeedINTCState intc[2];
diff --git a/hw/arm/aspeed_ast27x0-fc.c b/hw/arm/aspeed_ast27x0-fc.c
index e598f57ca2..4315e8da98 100644
--- a/hw/arm/aspeed_ast27x0-fc.c
+++ b/hw/arm/aspeed_ast27x0-fc.c
@@ -21,7 +21,7 @@
 #include "hw/loader.h"
 #include "hw/arm/boot.h"
 #include "hw/block/flash.h"
-
+#include "hw/arm/aspeed_coprocessor.h"
 
 #define TYPE_AST2700A1FC MACHINE_TYPE_NAME("ast2700fc")
 OBJECT_DECLARE_SIMPLE_TYPE(Ast2700FCState, AST2700A1FC);
@@ -115,8 +115,8 @@ static bool ast2700fc_ca35_init(MachineState *machine, Error **errp)
 
 static bool ast2700fc_ssp_init(MachineState *machine, Error **errp)
 {
-    AspeedSoCState *soc;
-    AspeedSoCClass *sc;
+    AspeedCoprocessorState *soc;
+    AspeedCoprocessorClass *sc;
     Ast2700FCState *s = AST2700A1FC(machine);
     s->ssp_sysclk = clock_new(OBJECT(s), "SSP_SYSCLK");
     clock_set_hz(s->ssp_sysclk, 200000000ULL);
@@ -129,8 +129,8 @@ static bool ast2700fc_ssp_init(MachineState *machine, Error **errp)
     object_property_set_link(OBJECT(&s->ssp), "memory",
                              OBJECT(&s->ssp_memory), &error_abort);
 
-    soc = ASPEED_SOC(&s->ssp);
-    sc = ASPEED_SOC_GET_CLASS(soc);
+    soc = ASPEED_COPROCESSOR(&s->ssp);
+    sc = ASPEED_COPROCESSOR_GET_CLASS(soc);
     aspeed_soc_uart_set_chr(soc->uart, ASPEED_DEV_UART4, sc->uarts_base,
                             sc->uarts_num, serial_hd(1));
     if (!qdev_realize(DEVICE(&s->ssp), NULL, errp)) {
diff --git a/hw/arm/aspeed_ast27x0-ssp.c b/hw/arm/aspeed_ast27x0-ssp.c
index f90d144372..1ebf06299e 100644
--- a/hw/arm/aspeed_ast27x0-ssp.c
+++ b/hw/arm/aspeed_ast27x0-ssp.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_SSP_RAM_SIZE (32 * MiB)
 
@@ -104,10 +105,11 @@ static struct nvic_intc_irq_info ast2700_ssp_intcmap[] = {
     {136, 0, 9, NULL},
 };
 
-static qemu_irq aspeed_soc_ast27x0ssp_get_irq(AspeedSoCState *s, int dev)
+static qemu_irq aspeed_soc_ast27x0ssp_get_irq(AspeedCoprocessorState *s,
+                                              int dev)
 {
     Aspeed27x0SSPSoCState *a = ASPEED27X0SSP_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_ast27x0ssp_get_irq(AspeedSoCState *s, int dev)
 static void aspeed_soc_ast27x0ssp_init(Object *obj)
 {
     Aspeed27x0SSPSoCState *a = ASPEED27X0SSP_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_ast27x0ssp_init(Object *obj)
 static void aspeed_soc_ast27x0ssp_realize(DeviceState *dev_soc, Error **errp)
 {
     Aspeed27x0SSPSoCState *a = ASPEED27X0SSP_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_ast27x0ssp_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_SSP_RAM_SIZE, errp)) {
         return;
     }
     memory_region_add_subregion(s->memory,
@@ -268,30 +270,24 @@ static void aspeed_soc_ast27x0ssp_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_ast27x0ssp_realize;
 
     sc->valid_cpu_types = valid_cpu_types;
     sc->silicon_rev = AST2700_A1_SILICON_REV;
-    sc->sram_size = AST2700_SSP_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_ast27x0ssp_irqmap;
     sc->memmap = aspeed_soc_ast27x0ssp_memmap;
-    sc->num_cpus = 1;
 }
 
 static const TypeInfo aspeed_soc_ast27x0ssp_types[] = {
     {
         .name           = TYPE_ASPEED27X0SSP_SOC,
-        .parent         = TYPE_ASPEED_SOC,
+        .parent         = TYPE_ASPEED_COPROCESSOR,
         .instance_size  = sizeof(Aspeed27x0SSPSoCState),
         .instance_init  = aspeed_soc_ast27x0ssp_init,
         .class_init     = aspeed_soc_ast27x0ssp_class_init,
diff --git a/hw/arm/meson.build b/hw/arm/meson.build
index 56bdb88b11..b9e02ace7f 100644
--- a/hw/arm/meson.build
+++ b/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-ssp.c',
   'aspeed_ast27x0-tsp.c',
   'aspeed_ast10x0.c',
   'aspeed_eeprom.c',
@@ -53,6 +52,7 @@ arm_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files(
 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_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'))
-- 
2.43.0