XHCI_IMAN
hcr = XRREAD4(sc, XHCI_IMAN(0));
XRWRITE4(sc, XHCI_IMAN(0), hcr | XHCI_IMAN_INTR_ENA);
DPRINTF(("%s: IMAN=%#x\n", DEVNAME(sc), XRREAD4(sc, XHCI_IMAN(0))));
XRWRITE4(sc, XHCI_IMAN(0), 0);
XRWRITE4(sc, XHCI_IMAN(0), 0);
intrs = XRREAD4(sc, XHCI_IMAN(0));
XRWRITE4(sc, XHCI_IMAN(0), intrs | XHCI_IMAN_INTR_PEND);