CD_IRQ
(*cscf->intr_establish)(sc, CD_IRQ, IPL_BIO, at91cf_intr_carddetect, ph);
return at91pio_intr_establish(sc->sc_pioc, which == CD_IRQ ? 4 : 3,
at91pio_intr_disestablish(sc->sc_pioc, which == CD_IRQ ? 4 : 3, cookie);