Yes, in past conditions that are not contrary to fact, the protasis or if-clause has the past indicative: "If I was tired, I went top bed." In contrary-to-fact conditions, the subjunctive is correct in the protasis: "If I were tired, I would go to bed," or in the past "If I had been tired, I would have gone to bed"). Tweedledee, in Through the Looking Glass, lays out the paradigm: "If it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic."
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With regard to "if" as a hypothetical future action, the colloquial use of the past tense "was" is as frequent as the technically correct tenses.
Examples:
"If he was ever late for work, his boss was angry."
"If the object of the meeting was to make him angry, then it succeeded."
(had been to make him angry is the meaning, but again, is seldom used)
