A hardship permit may be available to you if your license was suspended. Hardship permits generally are not available for license revocations including the lifetime revocation resulting from a third or greater DUII conviction. Keep in mind that there is often a significant "black out" or waiting period before you can obtain a hardship permit. Hardship permits are only available if you had a valid Oregon driver license at the time of your suspension.
Generally, these permits only allow driving for trips related to employment, treatment, and medical appointments. Also consider that to obtain a hardship permit you must, among other things, obtain an SR-22 certificate of liability insurance which will likely have negative implications for your insurance rates or insurability.
If you choose to enter the diversion program on your DUI charge, you probably will not have to file an SR-22 to get your license reinstated unless you apply for a hardship permit. However, if you are convicted of DUI you will have to file an SR-22 to reinstate your license anyway. Talk to an experienced DUI attorney before you apply for a hardship permit.
More questions about hardship permits? Call the DMV at 503.945.5037.