WT_DELAY
hwwrite(vortex->mmio, WT_DELAY(wt, 3), val);
hwwrite(vortex->mmio, WT_DELAY(wt, 2), val);
hwwrite(vortex->mmio, WT_DELAY(wt, 1), val);
hwwrite(vortex->mmio, WT_DELAY(wt, 0), val);
hwwrite(vortex->mmio, WT_DELAY(wt, 0), 0);
hwwrite(vortex->mmio, WT_DELAY(wt, 1), 0);
hwwrite(vortex->mmio, WT_DELAY(wt, 2), 0);
hwwrite(vortex->mmio, WT_DELAY(wt, 3), 0);