OTX_CPT_VFX_PF_MBOXX
writeq(mbx->msg, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));
writeq(mbx->data, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));
mbx.msg = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));
mbx.data = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));