hw/net/can: add ESP32-S3 TWAI peripheral emulation, which

inherits from the ESP32 TWAI implementation.

hw/net/can/esp32s3_twai.c

@@ -0,0 +1,97 @@
+/*
+ * ESP32-S3 TWAI (Two-Wire Automotive Interface) emulation
+ *
+ * Copyright (c) 2025 Espressif Systems (Shanghai) Co. Ltd.
+ *
+ * The ESP32-S3 TWAI peripheral is identical to ESP32 TWAI controller.
+ * It supports standard frame format (11-bit ID) and extended frame format
+ * (29-bit ID) with programmable bit rate up to 1 Mbps.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or
+ * (at your option) any later version.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "hw/net/can/esp32s3_twai.h"
+
+static uint64_t esp32s3_twai_read(void *opaque, hwaddr addr, unsigned int size)
+{
+    Esp32S3TWAIClass *class = ESP32S3_TWAI_GET_CLASS(opaque);
+
+    return class->parent_twai_read(opaque, addr, size);
+}
+
+static void esp32s3_twai_write(void *opaque, hwaddr addr, uint64_t value,
+                               unsigned int size)
+{
+    Esp32S3TWAIClass *class = ESP32S3_TWAI_GET_CLASS(opaque);
+    class->parent_twai_write(opaque, addr, value, size);
+}
+
+/* Implementation of ESP32-S3 TWAI device */
+static void esp32s3_twai_realize(DeviceState *dev, Error **errp)
+{
+    Esp32S3TWAIClass *esp32s3_class = ESP32S3_TWAI_GET_CLASS(dev);
+    Esp32TWAIState *s = ESP32_TWAI(dev);
+
+    esp32s3_class->parent_realize(dev, errp);
+
+    /* ESP32-S3 hardware defaults to PeliCAN mode and doesn't support BasicCAN */
+    s->sja_state.clock |= 0x80;
+}
+
+static void esp32s3_twai_reset(Object *obj, ResetType type)
+{
+    Esp32S3TWAIState *s = ESP32S3_TWAI(obj);
+    Esp32S3TWAIClass *esp32s3_class = ESP32S3_TWAI_GET_CLASS(obj);
+    
+    esp32s3_class->parent_reset(obj, type);
+    
+    /* ESP32-S3 hardware is always in PeliCAN mode */
+    s->parent.sja_state.clock |= 0x80;
+}
+
+static void esp32s3_twai_init(Object *obj)
+{
+    /* Parent class init is called automatically by QOM */
+}
+
+static void esp32s3_twai_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
+    Esp32S3TWAIClass *esp32s3_class = ESP32S3_TWAI_CLASS(klass);
+    Esp32TWAIClass *esp32_class = ESP32_TWAI_CLASS(klass);
+
+    device_class_set_parent_realize(dc, esp32s3_twai_realize, &esp32s3_class->parent_realize);
+
+    esp32s3_class->parent_reset = rc->phases.hold;
+    rc->phases.hold = esp32s3_twai_reset;
+
+    esp32s3_class->parent_twai_write = esp32_class->twai_write;
+    esp32s3_class->parent_twai_read = esp32_class->twai_read;
+    
+    esp32_class->twai_write = esp32s3_twai_write;
+    esp32_class->twai_read = esp32s3_twai_read;
+}
+
+static const TypeInfo esp32s3_twai_type_info = {
+    .name = TYPE_ESP32S3_TWAI,
+    .parent = TYPE_ESP32_TWAI,
+    .instance_size = sizeof(Esp32S3TWAIState),
+    .instance_init = esp32s3_twai_init,
+    .class_size = sizeof(Esp32S3TWAIClass),
+    .class_init = esp32s3_twai_class_init,
+};
+
+static void esp32s3_twai_register_types(void)
+{
+    type_register_static(&esp32s3_twai_type_info);
+}
+
+type_init(esp32s3_twai_register_types) 

hw/net/can/esp32s3_twai.h

@@ -0,0 +1,37 @@
+/*
+ * ESP32-S3 TWAI (Two-Wire Automotive Interface) emulation
+ *
+ * Copyright (c) 2025 Espressif Systems (Shanghai) Co. Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or
+ * (at your option) any later version.
+ */
+#ifndef ESP32S3_TWAI_H
+#define ESP32S3_TWAI_H
+
+#include "hw/net/can/esp32_twai.h"
+
+/* Device type name */
+#define TYPE_ESP32S3_TWAI "esp32s3.twai"
+#define ESP32S3_TWAI(obj) OBJECT_CHECK(Esp32S3TWAIState, (obj), TYPE_ESP32S3_TWAI)
+#define ESP32S3_TWAI_CLASS(klass) OBJECT_CLASS_CHECK(Esp32S3TWAIClass, klass, TYPE_ESP32S3_TWAI)
+#define ESP32S3_TWAI_GET_CLASS(obj) OBJECT_GET_CLASS(Esp32S3TWAIClass, obj, TYPE_ESP32S3_TWAI)
+
+/* ESP32-S3 TWAI device state */
+typedef struct Esp32S3TWAIState {
+    Esp32TWAIState parent;
+} Esp32S3TWAIState;
+
+/* ESP32-S3 TWAI device class */
+typedef struct Esp32S3TWAIClass {
+    Esp32TWAIClass parent_class;
+
+    /* Parent class method pointers for inheritance */
+    DeviceRealize parent_realize;
+    void (*parent_reset)(Object *obj, ResetType type);
+    void (*parent_twai_write)(void *opaque, hwaddr addr, uint64_t value, unsigned int size);
+    uint64_t (*parent_twai_read)(void *opaque, hwaddr addr, unsigned int size);
+} Esp32S3TWAIClass;
+
+#endif 

hw/net/can/meson.build

@@ -8,3 +8,4 @@ system_ss.add(when: 'CONFIG_XLNX_ZYNQMP', if_true: files('xlnx-zynqmp-can.c'))
 system_ss.add(when: 'CONFIG_XLNX_VERSAL', if_true: files('xlnx-versal-canfd.c'))
 system_ss.add(when: 'CONFIG_XTENSA_ESP32', if_true: files('esp32_twai.c'))
 system_ss.add(when: 'CONFIG_RISCV_ESP32C3', if_true: files('esp32_twai.c', 'esp32c3_twai.c'))
+system_ss.add(when: 'CONFIG_XTENSA_ESP32S3', if_true: files('esp32_twai.c', 'esp32s3_twai.c'))