Hello Raynald,
the ABAP perspective is only available when you have installed the ABAP Development Tools (SAP Development Tools for Eclipse). You can install them also for HANA Studio (just follow the steps in the link).
But just having the perspective will not give you any information which ABAP systems uses your HANA systems (if at least a NW system sits on top; this must not be the case). In the ABAP perspective you have to add ABAP projects, which can be a connection to any supported ABAP system.
Regards,
Florian