Function ti_mbox_attach

freebsd/arm/ti/ti_mbox.c:134–204

}

static int
ti_mbox_attach(device_t dev)
{
	struct ti_mbox_softc *sc;
	int rid, delay, chan;
	uint32_t rev, sysconfig;

	if (ti_sysc_clock_enable(device_get_parent(dev)) != 0) {
		device_printf(dev, "could not enable MBOX clock\n");
		return (ENXIO);
	}

	sc = device_get_softc(dev);
	rid = 0;
	mtx_init(&sc->sc_mtx, "TI mbox", NULL, MTX_DEF);
	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
	    RF_ACTIVE);
	if (sc->sc_mem_res == NULL) {
		device_printf(dev, "could not allocate memory resource\n");
		return (ENXIO);
	}
	sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
	sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
	rid = 0;
	sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
	    RF_ACTIVE);
	if (sc->sc_irq_res == NULL) {
		device_printf(dev, "could not allocate interrupt resource\n");
		ti_mbox_detach(dev);
		return (ENXIO);
	}
	if (bus_setup_intr(dev, sc->sc_irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
	    NULL, ti_mbox_intr, sc, &sc->sc_intr) != 0) {
		device_printf(dev, "unable to setup the interrupt handler\n");
		ti_mbox_detach(dev);
		return (ENXIO);
	}
	/*
	 * Reset the controller.
	 */
	sysconfig = ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG);
	DPRINTF("initial sysconfig %d\n", sysconfig);
	sysconfig |= TI_MBOX_SYSCONFIG_SOFTRST;
	delay = 100;
	while (ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG) & 
	    TI_MBOX_SYSCONFIG_SOFTRST) {
		delay--;
		DELAY(10);
	}
	if (delay == 0) {
		device_printf(dev, "controller reset failed\n");
		ti_mbox_detach(dev);
		return (ENXIO);
	}
	/*
	 * Enable smart idle mode.
	 */
	ti_mbox_reg_write(sc, TI_MBOX_SYSCONFIG,