+#else
+static pci_dev_t ehci_find_class(int index)
+{
+ int bus;
+ int devnum;
+ pci_dev_t bdf;
+ uint32_t class;
+
+ for (bus = 0; bus <= pci_last_busno(); bus++) {
+ for (devnum = 0; devnum < PCI_MAX_PCI_DEVICES-1; devnum++) {
+ pci_read_config_dword(PCI_BDF(bus, devnum, 0),
+ PCI_CLASS_REVISION, &class);
+ if (class >> 16 == 0xffff)
+ continue;
+
+ for (bdf = PCI_BDF(bus, devnum, 0);
+ bdf <= PCI_BDF(bus, devnum,
+ PCI_MAX_PCI_FUNCTIONS - 1);
+ bdf += PCI_BDF(0, 0, 1)) {
+ pci_read_config_dword(bdf, PCI_CLASS_REVISION,
+ &class);
+ class >>= 8;
+ /*
+ * Here be dragons! In case we have multiple
+ * PCI EHCI controllers, this function will
+ * be called multiple times as well. This
+ * function will scan the PCI busses, always
+ * starting from bus 0, device 0, function 0,
+ * until it finds an USB controller. The USB
+ * stack gives us an 'index' of a controller
+ * that is currently being registered, which
+ * is a number, starting from 0 and growing
+ * in ascending order as controllers are added.
+ * To avoid probing the same controller in tne
+ * subsequent runs of this function, we will
+ * skip 'index - 1' detected controllers and
+ * report the index'th controller.
+ */
+ if (class != PCI_CLASS_SERIAL_USB_EHCI)
+ continue;
+ if (index) {
+ index--;
+ continue;
+ }
+ /* Return index'th controller. */
+ return bdf;
+ }
+ }
+ }
+
+ return -ENODEV;
+}