SL11_E0CTRL
sl11write(sc, SL11_E0CTRL, cmd | toggle);
sl11write(sc, SL11_E0CTRL, SL11_EPCTRL_ARM);
slhci_write(sc, SL11_E0CTRL, spipe->control);
slhci_write(sc, SL11_E0CTRL, SL11_EPCTRL_ARM);
r = slhci_read(ssc, SL11_E0CTRL);
#define SL11_E1CTRL (SL11_E1BASE + SL11_E0CTRL)