ra_uart2gpiomode
r &= ra_uart2gpiomode(rtsc->sc_addr);
r |= __SHIFTIN(0, ra_uart2gpiomode(rtsc->sc_addr));
r &= ra_uart2gpiomode(RALINK_CONADDR);
r |= __SHIFTIN(1, ra_uart2gpiomode(RALINK_CONADDR));
r &= ra_uart2gpiomode(RALINK_CONADDR);
r |= __SHIFTIN(0, ra_uart2gpiomode(RALINK_CONADDR));