Bridalveil Creek Campground is off Glacier Point Road, and is open approximately July through approximately early September, no reservations - it's strictly first-come, first-served.
This campground has 110 sites (RVs allowed), and each campsite is equipped with a fire ring, a picnic table, nearby restrooms with flushing toilets, and drinkable water. The food lockers are shared.
You have to go down to Curry Village and Housekeeping Camp for showers - about a half-hour drive. See more at Discover Northern California: http://tinyurl.com/6gcur48