Involved in the regulation of the onset of mitosis. Involved in a pathway that coordinates cell proliferation and differentiation. Implicated in spindle pole body (SPD) duplication. Dual specificity kinase that can phosphorylate serine; threonine and tyrosine residues. Phosphorylates the SPC29 and SPC110 spindle pole body components. {ECO:0000269|PubMed:11278681; ECO:0000269|PubMed:19269975}.