#2 and #3 are correct, but #1 is not. You should not use the auxiliary verb "did" making negative sentences if you have the construction "used to". You can say, for example, either Did Tom use to get up at 6?
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IvantalkAlso, the dictioary tell me that the question form (used you to .....?) is only used in Bre, usually in writing. (old-fashioned or formal )That's BrE I am learning!
Grammar GeekHello, GG!
I didn't used to waste so much time on computer games, but now they are addicting.
I wasn't used to hearing that kind of language from a priest.