Exemplo n.º 1
0
static int
acpi_pcib_pci_attach(device_t dev)
{
    struct acpi_pcib_softc *sc;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    pcib_attach_common(dev);
    sc = device_get_softc(dev);
    sc->ap_handle = acpi_get_handle(dev);
    return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_pcibsc.secbus));
}
Exemplo n.º 2
0
static int
acpi_pcib_acpi_attach(device_t dev)
{
    struct acpi_hpcib_softc	*sc;
    ACPI_STATUS			status;
    static int bus0_seen = 0;
    u_int addr, slot, func, busok;
    uint8_t busno;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    sc = device_get_softc(dev);
    sc->ap_dev = dev;
    sc->ap_handle = acpi_get_handle(dev);

    /*
     * Get our segment number by evaluating _SEG
     * It's OK for this to not exist.
     */
    status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
    if (ACPI_FAILURE(status)) {
	if (status != AE_NOT_FOUND) {
	    device_printf(dev, "could not evaluate _SEG - %s\n",
		AcpiFormatException(status));
	    return_VALUE (ENXIO);
	}
	/* If it's not found, assume 0. */
	sc->ap_segment = 0;
    }

    /*
     * Get our base bus number by evaluating _BBN.
     * If this doesn't work, we assume we're bus number 0.
     *
     * XXX note that it may also not exist in the case where we are
     *     meant to use a private configuration space mechanism for this bus,
     *     so we should dig out our resources and check to see if we have
     *     anything like that.  How do we do this?
     * XXX If we have the requisite information, and if we don't think the
     *     default PCI configuration space handlers can deal with this bus,
     *     we should attach our own handler.
     * XXX invoke _REG on this for the PCI config space address space?
     * XXX It seems many BIOS's with multiple Host-PCI bridges do not set
     *     _BBN correctly.  They set _BBN to zero for all bridges.  Thus,
     *     if _BBN is zero and PCI bus 0 already exists, we try to read our
     *     bus number from the configuration registers at address _ADR.
     *     We only do this for domain/segment 0 in the hopes that this is
     *     only needed for old single-domain machines.
     */
    status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
    if (ACPI_FAILURE(status)) {
	if (status != AE_NOT_FOUND) {
	    device_printf(dev, "could not evaluate _BBN - %s\n",
		AcpiFormatException(status));
	    return_VALUE (ENXIO);
	} else {
	    /* If it's not found, assume 0. */
	    sc->ap_bus = 0;
	}
    }

    /*
     * If this is segment 0, the bus is zero, and PCI bus 0 already
     * exists, read the bus number via PCI config space.
     */
    busok = 1;
    if (sc->ap_segment == 0 && sc->ap_bus == 0 && bus0_seen) {
	busok = 0;
	status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
	if (ACPI_FAILURE(status)) {
	    if (status != AE_NOT_FOUND) {
		device_printf(dev, "could not evaluate _ADR - %s\n",
		    AcpiFormatException(status));
		return_VALUE (ENXIO);
	    } else
		device_printf(dev, "couldn't find _ADR\n");
	} else {
	    /* XXX: We assume bus 0. */
	    slot = ACPI_ADR_PCI_SLOT(addr);
	    func = ACPI_ADR_PCI_FUNC(addr);
	    if (bootverbose)
		device_printf(dev, "reading config registers from 0:%d:%d\n",
		    slot, func);
	    if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
		device_printf(dev, "couldn't read bus number from cfg space\n");
	    else {
		sc->ap_bus = busno;
		busok = 1;
	    }
	}
    }

    /*
     * If nothing else worked, hope that ACPI at least lays out the
     * host-PCI bridges in order and that as a result our unit number
     * is actually our bus number.  There are several reasons this
     * might not be true.
     */
    if (busok == 0) {
	sc->ap_bus = device_get_unit(dev);
	device_printf(dev, "trying bus number %d\n", sc->ap_bus);
    }

    /* If this is bus 0 on segment 0, note that it has been seen already. */
    if (sc->ap_segment == 0 && sc->ap_bus == 0)
	    bus0_seen = 1;

    return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
}