USBHC_HR_FSBIR
HWRITE4(sc, USBHC_HR, (hr & USBHC_HR_MASK) | USBHC_HR_FSBIR);
while (HREAD4(sc, USBHC_HR) & USBHC_HR_FSBIR)
#define USBHC_HR_MASK (USBHC_HR_FSBIR | USBHC_HR_FHR | \