Ghana

(1) A person who alleges that –
(a) an enactment or anything contained in or done under the authority of that or any other enactment; or
(b) any act or omission of any person;
is inconsistent with, or is in contravention of a provision of this Constitution, may bring an action in the Supreme Court for a declaration to that effect.
(2) The Supreme Court shall, for the purposes of a declaration under clause (1) of this article, make such orders and give such directions as it may consider appropriate for giving effect, or enabling effect to be given, to the declaration so made.
… (Art. 2)

(1) Subject to the jurisdiction of the High Court in the enforcement of the Fundamental Human Rights and Freedoms as provided in article 33 of this Constitution, the Supreme Court shall have exclusive original jurisdiction in—
(a) all matters relating to the enforcement or interpretation of this Constitution; and
(b) all matters arising as to whether an enactment was made in excess of the powers conferred on Parliament or any other authority or person by law or under this Constitution.
(2) Where an issue that relates to a matter or question referred to in clause (1) of this article arises in any proceedings in a court other than the Supreme Court, that court shall stay the proceedings and refer the question of law involved to the Supreme Court for determination; and the court in which the question arose shall dispose of the case in accordance with the decision of the Supreme Court. (Art. 130)