Function emac_attach

freebsd/arm/allwinner/if_emac.c:886–993

}

static int
emac_attach(device_t dev)
{
	struct emac_softc *sc;
	struct ifnet *ifp;
	int error, rid;
	uint8_t eaddr[ETHER_ADDR_LEN];

	sc = device_get_softc(dev);
	sc->emac_dev = dev;

	error = 0;
	mtx_init(&sc->emac_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
	    MTX_DEF);
	callout_init_mtx(&sc->emac_tick_ch, &sc->emac_mtx, 0);

	rid = 0;
	sc->emac_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
	    RF_ACTIVE);
	if (sc->emac_res == NULL) {
		device_printf(dev, "unable to map memory\n");
		error = ENXIO;
		goto fail;
	}

	sc->emac_tag = rman_get_bustag(sc->emac_res);
	sc->emac_handle = rman_get_bushandle(sc->emac_res);

	rid = 0;
	sc->emac_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
	    RF_SHAREABLE | RF_ACTIVE);
	if (sc->emac_irq == NULL) {
		device_printf(dev, "cannot allocate IRQ resources.\n");
		error = ENXIO;
		goto fail;
	}
	/* Create device sysctl node. */
	SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
	    OID_AUTO, "process_limit",
	    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
	    &sc->emac_rx_process_limit, 0, sysctl_hw_emac_proc_limit, "I",
	    "max number of Rx events to process");

	sc->emac_rx_process_limit = EMAC_PROC_DEFAULT;
	error = resource_int_value(device_get_name(dev), device_get_unit(dev),
	    "process_limit", &sc->emac_rx_process_limit);
	if (error == 0) {
		if (sc->emac_rx_process_limit < EMAC_PROC_MIN ||
		    sc->emac_rx_process_limit > EMAC_PROC_MAX) {
			device_printf(dev, "process_limit value out of range; "
			    "using default: %d\n", EMAC_PROC_DEFAULT);
			sc->emac_rx_process_limit = EMAC_PROC_DEFAULT;
		}
	}
	/* Setup EMAC */
	error = emac_sys_setup(sc);
	if (error != 0)