usb host port3 on pxa310?

[Chen Wenjie]

I want to use PXA310 to realize a USB HOST.

(My kernel version: 2.6.27)

Zylonite have implemented a USB host through USBH_N(USBH1_N) USBH_P(USBH1_P).
Unfortunatly, In PXA310, the pins of USBH1_N and USBH1_P does not exist.

So I have to use  "usb host port3 " described in the manual "Vol. IV: Monahans 
L Processor and
Monahans LV Processor Developers Manual"



GPIO
Alternate
Function
Port					UP3OCR[CFG]
			0x0 					   0x2 	
USB_P3_1	UHC Rx Data	(RCV - in)	—	UHC Rx Data	(RCV - 
out)	—
USB_P3_2	UHC OE	(OE_n - out)	—	UHC OE		(OE_n - in)
	—
USB_P3_3	UHC Rx D–	(VM - in)	—	UHC Rx D-	(VM - 
out)	—
USB_P3_4	UHC Tx D–	(VMO - out)	—	UHC Tx D-	(VMO - 
in)	—
USB_P3_5	UHC Rx D+	(VP - in)	—	UHC Rx D+	(VP - 
out)	—
USB_P3_6	UHC Tx D+	(VPO - out)	—	UHC Tx D+	(VPO - 
in)	—

In the schematic, I have connected GPIO77~82 to USB_P3_1 ~ USB_P3_6.



However, The USB port 3 does not work.
Here is the log:

======================================
pxa27x-ohci pxa27x-ohci: PXA27x OHCI
pxa27x-ohci pxa27x-ohci: new USB bus registered, assigned bus number 1
pxa27x-ohci pxa27x-ohci: irq 3, io mem 0x4c000000
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 3 ports detected
usb usb1: New USB device found, idVendor=1d6b, idProduct=0001
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: PXA27x OHCI
usb usb1: Manufacturer: Linux 2.6.27-dirty ohci_hcd
usb usb1: SerialNumber: pxa27x
sl811: driver sl811-hcd, 19 May 2005
r8a66597_hcd: driver r8a66597_hcd, 10 Apr 2008
usb 1-3: new full speed USB device using pxa27x-ohci and address 2
usb 1-3: device descriptor read/64, error -62
usb 1-3: device descriptor read/64, error -62
usb 1-3: new full speed USB device using pxa27x-ohci and address 3
usb 1-3: device descriptor read/64, error -62
usb 1-3: device descriptor read/64, error -62
usb 1-3: new full speed USB device using pxa27x-ohci and address 4
usb 1-3: device not accepting address 4, error -62
usb 1-3: new full speed USB device using pxa27x-ohci and address 5
usb 1-3: device not accepting address 5, error -62
hub 1-0:1.0: unable to enumerate USB device on port 3
======================================


Then I found a bit in UP2OCR -- (VPMBlockEnbN).
It is quite strange (if not ugly:( ) the this bit is to control port 3
(In UP2OCR--a register for port 2, while there is too many unused bits in 
UP3OCR)

But I am not very sure how to use this bit.
I grep the source tree, but found nothing about VPMBlockEnbN.


Can anyone tell me that how to write a driver for USB-host-port-3?

High appreciation for your kind help!