The man charged with shooting up Lil Wayne‘s tour bus has blown the whistle on Birdman  … saying he should be behind bars too.

Jimmy Winfrey claims in new court docs he shouldn’t be singled out for the crime, when “[Birdman’s] financial dispute with [Lil Wayne] is what ultimately led to the shooting.”

So, Winfrey argues, “[Birdman] should be held liable as a party to the crime.”  He’s not specifically saying Birdman ordered the hit, but essentially that’s what he’s saying.

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As TMZ first reported, Wayne’s tour bus was shot up back in April as he was leaving a club gig in Atlanta.

Birdman denies any involvement.