some info
linux-b4lz:~ # lsusb
Bus 002 Device 002: ID 8087:8001 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8009 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0
Bus 003 Device 002: ID 046d:081b Logitech, Inc. Webcam C310
Bus 003 Device 008: ID 03f0:0417 Hewlett-Packard LaserJet 1200 series
Bus 003 Device 007: ID 0443:000c Gateway, Inc.
Bus 003 Device 006: ID 0443:000d Gateway, Inc.
Bus 003 Device 005: ID 046d:c016 Logitech, Inc. Optical Wheel Mouse
Bus 003 Device 004: ID 152d:2338 JMicron Technology Corp. / JMicron USA Technology Corp. JM20337 Hi-Speed USB to SATA & PATA Combo Bridge
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
linux-b4lz:~ # dmesg | grep xhci
0.863312] xhci_hcd 0000:00:14.0: setting latency timer to 64
0.863314] xhci_hcd 0000:00:14.0: xHCI Host Controller
0.863318] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 3
0.863466] xhci_hcd 0000:00:14.0: cache line size of 64 is not supported
0.863480] xhci_hcd 0000:00:14.0: irq 42 for MSI/MSI-X
0.863520] usb usb3: Manufacturer: Linux 3.11.10-29-desktop xhci_hcd
0.863578] xHCI xhci_add_endpoint called for root hub
0.863579] xHCI xhci_check_bandwidth called for root hub
0.865030] xhci_hcd 0000:00:14.0: xHCI Host Controller
0.865033] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 4
0.865053] usb usb4: Manufacturer: Linux 3.11.10-29-desktop xhci_hcd
0.865273] xHCI xhci_add_endpoint called for root hub
0.865274] xHCI xhci_check_bandwidth called for root hub
1.218582] usb 3-6: new high-speed USB device number 2 using xhci_hcd
1.603223] usb 3-7: new full-speed USB device number 3 using xhci_hcd
1.769485] usb 3-12: new high-speed USB device number 4 using xhci_hcd
1.935760] usb 3-13: new low-speed USB device number 5 using xhci_hcd
2.106067] usb 3-14: new full-speed USB device number 6 using xhci_hcd
2.393622] usb 3-14.1: new full-speed USB device number 7 using xhci_hcd
494.178042] usb 3-5: new full-speed USB device number 8 using xhci_hcd
linux-b4lz:~ # lsmod | grep -i hci
xhci_hcd 108655 0
linux-b4lz:~ # lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/14p, 480M
|__ Port 5: Dev 8, If 0, Class=Printer, Driver=, 12M
|__ Port 6: Dev 2, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 6: Dev 2, If 1, Class=Video, Driver=uvcvideo, 480M
|__ Port 6: Dev 2, If 2, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 6: Dev 2, If 3, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 7: Dev 3, If 0, Class=Vendor Specific Class, Driver=btusb, 12M
|__ Port 7: Dev 3, If 1, Class=Vendor Specific Class, Driver=btusb, 12M
|__ Port 7: Dev 3, If 2, Class=Vendor Specific Class, Driver=, 12M
|__ Port 7: Dev 3, If 3, Class=Application Specific Interface, Driver=, 12M
|__ Port 12: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 480M
|__ Port 13: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 14: Dev 6, If 0, Class=Hub, Driver=hub/2p, 12M
|__ Port 1: Dev 7, If 0, Class=Human Interface Device, Driver=usbhid, 12M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
linux-b4lz:~ # lspci | grep USB
00:14.0 USB controller: Intel Corporation Device 8cb1
00:1a.0 USB controller: Intel Corporation Device 8cad
00:1d.0 USB controller: Intel Corporation Device 8ca6