[ot] hw/opentitan: ot_i2c_transport: add reset & be change handlers

Signed-off-by: Alice Ziuziakowska <[email protected]>

Author: ziuziakowska

hw/opentitan/ot_i2c_transport.c

@@ -60,6 +60,11 @@ struct OtI2CTransportState {
     CharBackend chr;
 };
 
+struct OtI2CTransportClass {
+    SysBusDeviceClass parent_class;
+    ResettablePhases parent_phases;
+};
+
 static void ot_i2c_transport_put_send_failure(OtI2CTransportState *s)
 {
     uint8_t fmt_byte[2] = { '!', '!' };
@@ -207,15 +212,42 @@ static void ot_i2c_transport_receive(void *opaque, const uint8_t *buf, int size)
     }
 }
 
+static int ot_i2c_transport_be_change(void *opaque)
+{
+    OtI2CTransportState *s = OT_I2C_TRANSPORT(opaque);
+
+    qemu_chr_fe_set_handlers(&s->chr, ot_i2c_transport_can_receive,
+                             ot_i2c_transport_receive, NULL,
+                             ot_i2c_transport_be_change, s, NULL, true);
+
+    return 0;
+}
+
+static void ot_i2c_transport_reset_enter(Object *obj, ResetType type)
+{
+    OtI2CTransportClass *c = OT_I2C_TRANSPORT_GET_CLASS(obj);
+    OtI2CTransportState *s = OT_I2C_TRANSPORT(obj);
+
+    if (c->parent_phases.enter) {
+        c->parent_phases.enter(obj, type);
+    }
+
+    i2c_end_transfer(s->bus);
+    fifo8_reset(&s->cmd_bytes_fifo);
+    s->parser_state = OT_I2C_CMD_INIT;
+    s->is_read_command = false;
+    s->byte = 0u;
+}
+
 static void ot_i2c_transport_realize(DeviceState *dev, Error **errp)
 {
     (void)errp;
     OtI2CTransportState *state = OT_I2C_TRANSPORT(dev);
     BusState *bus = qdev_get_parent_bus(dev);
     state->bus = I2C_BUS(bus);
     qemu_chr_fe_set_handlers(&state->chr, ot_i2c_transport_can_receive,
-                             ot_i2c_transport_receive, NULL, NULL, state, NULL,
-                             true);
+                             ot_i2c_transport_receive, NULL,
+                             ot_i2c_transport_be_change, state, NULL, true);
 }
 
 static void ot_i2c_transport_init(Object *obj)
@@ -241,6 +273,11 @@ static void ot_i2c_transport_class_init(ObjectClass *klass, void *data)
     device_class_set_props(dc, ot_i2c_transport_properties);
     dc->realize = ot_i2c_transport_realize;
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
+    OtI2CTransportClass *ic = OT_I2C_TRANSPORT_CLASS(klass);
+    resettable_class_set_parent_phases(rc, &ot_i2c_transport_reset_enter, NULL,
+                                       NULL, &ic->parent_phases);
 }
 
 static const TypeInfo ot_i2c_transport = {

include/hw/opentitan/ot_i2c_transport.h

@@ -31,6 +31,6 @@
 #include "qom/object.h"
 
 #define TYPE_OT_I2C_TRANSPORT "ot-i2c-transport"
-OBJECT_DECLARE_SIMPLE_TYPE(OtI2CTransportState, OT_I2C_TRANSPORT)
+OBJECT_DECLARE_TYPE(OtI2CTransportState, OtI2CTransportClass, OT_I2C_TRANSPORT)
 
 #endif /* HW_OPENTITAN_OT_I2C_TRANSPORT_H */