Hello Sarah, Thanks a lot for the information. For your information i am successfully able to enumerate USB device(USB keyboard) over XHCI port by the help of XHCI Stack patch provided in u-boot and also able to do BULK transfer over Mass storage device.
After successfully able to do CONTROL and BULK transfer i decided to go for INTERRUPT transfer which i dont know is possible or not. Definately i dont have deep knowledge about Linux USB stack and so i posted the query to get some understanding of it. Also, when you say EHCI can bit-bang the interface what do you mean by that?? Thanks Puneet On Tue, 2013-04-09 at 04:31 +0530, Sarah Sharp wrote: > The Linux xHCI driver relies on the USB core for setup. You really > don't want to attempt to to separate the two. You can't get "just" > interrupts for transfers either -- you need to do a lot of xHCI host > setup before you can even send a control transfer to the device (which > is necessary to find out whether it *is* a keyboard). > > Also, xHCI is not like EHCI, where you can bit-bang the interface. You > have to have MMIO and DMA set up before you can use the xHCI host. You > might be able to get away without having interrupts and polling the > event ring, but I've never tried using any xHCI hosts that way. > > Also, I don't know what the license is for uboot, but you should know > that the xHCI driver is GPL v2 only, and we can't change that. > > If the license is ok, and you want to take a stab at using the code, > it's in drivers/usb/host/xhci*, with some bits in > drivers/usb/host/pci-quirks.c. > > I think you've got some serious yak-shaving ahead of you, so you should > think about whether you actually want to add xHCI support to uboot. > It's clear that you don't know much about the Linux USB stack, and I'm > afraid porting the xHCI driver code over to uboot is going to be pretty > painful for you. > > Sarah Sharp > > On Wed, Apr 03, 2013 at 11:23:56AM +0530, Puneet Sharma wrote: > > Hello Sarah, > > > > > > I want to test USB keyboard for XHCI in u-boot and to do that i need the > > Interrupt transfer code in XHCI controller driver. If possible, can you > > help me to give that piece of code or can you help me to figure out in > > kernel where can i find it so that i can try to replicate it in u-boot and > > make it work. > > > > > > Thanks & Regards > > -- > > Puneet Sharma <puneet.sha...@moschip.com<mailto:puneet.sha...@moschip.com>> > > > > ________________________________ > > The information contained in this email and any attachments is confidential > > and may be subject to copyright or other intellectual property protection. > > If you are not the intended recipient, you are not authorized to use or > > disclose this information, and we request that you notify us by reply mail > > or telephone and delete the original message from your mail system. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
