[U-Boot] xhci USB controller driver for x86 board

[Ding, ChiX]

Hi there
I'm having problem getting USB 3.0 controller working properly on the Intel Denverton x86 board.
First I tried to use xhci driver, but there doesn't seem to be any xhci driver or generic driver for x86
I only found the following
xhci-exynos5.c:   { .compatible = "samsung,exynos5250-xhci" }, 
xhci-mvebu.c:     { .compatible = "marvell,armada3700-xhci" }, 
xhci-rockchip.c:  { .compatible = "rockchip,rk3399-xhci" },

Then I tried to use ehci driver, as there is generic driver for ehci-pci
ehci-pci.c:     { .compatible = "ehci-pci" },

I added the section into device tree file
                usb_0: usb at 15,0 {
                        reg = <0x0000a800 0 0 0 0>;
                        compatible = "ehci-pci";
                };

When I run "usb start", U-boot is able to find the controller, but doesn't detect the usb keyboard or
Pendrive which are plugged to the USB ports.

=> usb info
1: Hub,  USB Revision 2.0
- u-boot EHCI Host Controller 
 - Class: Hub
- PacketSize: 64  Configurations: 1
- Vendor: 0x0000  Product 0x0000 Version 1.0
   Configuration: 1
   - Interfaces: 1 Self Powered 0mA
     Interface: 0
     - Alternate Setting 0, Endpoints: 1
     - Class Hub
     - Endpoint 1 In Interrupt MaxPacket 8 Interval 255ms

I see the following in the log. It doesn't find child devices when scanning.
scanning bus 0 for devices... 
Calling usb_setup_device(), portnr=0
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0 length 0x40
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4ef080, udev->dev='usb at 15,0', portnr=0
req=6 (0x6), type=128 (0x80), value=256, index=0
USB_DT_DEVICE request
set address 1
usb_control_msg: request: 0x5, requesttype: 0x0, value 0x1 index 0x0 length 0x0
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4ef080, udev->dev='usb at 15,0', portnr=0
req=5 (0x5), type=0 (0x0), value=1, index=0
USB_REQ_SET_ADDRESS
Len is 0
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x100 index 0x0 length 0x12
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4ef080, udev->dev='usb at 15,0', portnr=0
req=6 (0x6), type=128 (0x80), value=256, index=0
USB_DT_DEVICE request
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0 length 0x9
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4ef080, udev->dev='usb at 15,0', portnr=0
req=6 (0x6), type=128 (0x80), value=512, index=0
USB_DT_CONFIG config
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x200 index 0x0 length 0x19
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4ef080, udev->dev='usb at 15,0', portnr=0
req=6 (0x6), type=128 (0x80), value=512, index=0
USB_DT_CONFIG config
get_conf_no 0 Result 25, wLength 25
if 0, ep 0
##EP epmaxpacketin[1] = 8
set configuration 1
usb_control_msg: request: 0x9, requesttype: 0x0, value 0x1 index 0x0 length 0x0
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4ef080, udev->dev='usb at 15,0', portnr=0
req=9 (0x9), type=0 (0x0), value=1, index=0
USB_REQ_SET_CONFIGURATION
Len is 0
new device strings: Mfr=1, Product=2, SerialNumber=0
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x300 index 0x0 length 0xFF
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4ef080, udev->dev='usb at 15,0', portnr=0
req=6 (0x6), type=128 (0x80), value=768, index=0
USB_DT_STRING config
USB device number 1 default language ID 0x1
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x301 index 0x1 length 0xFF
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4ef080, udev->dev='usb at 15,0', portnr=0
req=6 (0x6), type=128 (0x80), value=769, index=1
USB_DT_STRING config
usb_control_msg: request: 0x6, requesttype: 0x80, value 0x302 index 0x1 length 0xFF
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4ef080, udev->dev='usb at 15,0', portnr=0
req=6 (0x6), type=128 (0x80), value=770, index=1
USB_DT_STRING config
Manufacturer u-boot
Product      EHCI Host Controller
SerialNumber 
read_descriptor for 'usb at 15,0': ret=0
** usb_find_child returns -2
usb_find_and_bind_driver: Searching for driver
Bound device usb_hub to usb at 15,0
usb_find_and_bind_driver: Match found: usb_hub
usb_scan_device: Probing 'usb_hub', plat=7f4f53c0
uclass_find_device_by_seq: 0 -1
uclass_find_device_by_seq: 0 0
   - -1 -1
   - not found
usb_hub_post_probe
usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index 0x0 length 0x4
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4f5400, udev->dev='usb_hub', portnr=0
req=6 (0x6), type=160 (0xa0), value=10496, index=0
USB_DT_HUB config
usb_control_msg: request: 0x6, requesttype: 0xA0, value 0x2900 index 0x0 length 0x8
ehci_submit_control_msg: dev='usb at 15,0', udev=7f4f5400, udev->dev='usb_hub', portnr=0
req=6 (0x6), type=160 (0xa0), value=10496, index=0
USB_DT_HUB config
0 ports detected


I wonder if this is caused by using ehci driver on xhci controller? And currently is there xhci controller
Driver for x86 based board?

Thanks a lot,
Chi
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