RNGC_CONTROL
ctrl = readl(rngc->base + RNGC_CONTROL);
writel(ctrl, rngc->base + RNGC_CONTROL);
ctrl = readl(rngc->base + RNGC_CONTROL);
writel(ctrl, rngc->base + RNGC_CONTROL);
ctrl = readl(rngc->base + RNGC_CONTROL);
writel(ctrl, rngc->base + RNGC_CONTROL);