Function ti_spi_attach

freebsd/arm/ti/ti_spi.c:165–271

}

static int
ti_spi_attach(device_t dev)
{
	int err, i, rid, timeout;
	struct ti_spi_softc *sc;
	uint32_t rev;

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

	/* Activate the McSPI module. */
	err = ti_sysc_clock_enable(device_get_parent(dev));
	if (err) {
		device_printf(dev, "Error: failed to activate source clock\n");
		return (err);
	}

	/* Get the number of available channels. */
	if ((OF_getencprop(ofw_bus_get_node(dev), "ti,spi-num-cs",
	    &sc->sc_numcs, sizeof(sc->sc_numcs))) <= 0) {
		sc->sc_numcs = 2;
	}

	rid = 0;
	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
	    RF_ACTIVE);
	if (!sc->sc_mem_res) {
		device_printf(dev, "cannot allocate memory window\n");
		return (ENXIO);
	}

	sc->sc_bst = rman_get_bustag(sc->sc_mem_res);
	sc->sc_bsh = 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) {
		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
		device_printf(dev, "cannot allocate interrupt\n");
		return (ENXIO);
	}

	/* Hook up our interrupt handler. */
	if (bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
	    NULL, ti_spi_intr, sc, &sc->sc_intrhand)) {
		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq_res);
		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
		device_printf(dev, "cannot setup the interrupt handler\n");
		return (ENXIO);
	}

	mtx_init(&sc->sc_mtx, "ti_spi", NULL, MTX_DEF);

	/* Issue a softreset to the controller */
	TI_SPI_WRITE(sc, MCSPI_SYSCONFIG, MCSPI_SYSCONFIG_SOFTRESET);
	timeout = 1000;
	while (!(TI_SPI_READ(sc, MCSPI_SYSSTATUS) &