Hi!
This might be a bit off topic, but I hope someone might be able to help me.
I'm currently doing a port of the USB Host mode driver for Samsung
Galaxy S and similar devices (S5PV210 / S5PC110 platform). This chipset
uses the same Synopsys OTG, as some other devices, liek the designware
one. One of the major problems with the driver that it doesn't support
split transactions (and neither does it isochronous transactions, but
that's a smaller problem yet), so no USB 1.x support through USB 2 hubs.
(And besides the driver does reset the hubs a lot of times, making the
usb access jerky. This might be a hardware issue though)
As far as I know I'm using the latest avialable version of this driver,
so the above two things seem to be not implemented in the latest release
either.
Now I'm thinking of either porting the split and isochronous support
back to the S3C driver, or simply replaceing the driver with some of the
alternatives. My questions are:
1. Are the drivers, that I've found the latest/best one, or are there
more of them?
2. What do you suggest: porting split/isochronous transactions to the
the curent code, or dropping the whole code and try to get another
driver working? (Mainly looking at the DWC implementation, as in the IFX
one the bit order in the structs are the opposite than of the S3C one.
Both of them are MIPS not ARM though afaik). I did already had some
success with the DWC implementation (probe successed and the root hub
was created. It didn't see external devices, so probably the IRQ handler
didn't work). I only want to port the USB host part, as the USB client
part is working fine (the changing between them is done by simply
disabling the irqs in the client driver then probeing the host driver.
they aren't really interconnected)
3. What other suggestions you have to me while doing the port?
Here are the sources of the files I'm currently using:
Source of S3C OTG Host driver:
https://github.com/sztupy/samsung-kernel-aries/tree/android-samsung-3.0-ics/drivers/usb/host/s3c-otg
Source of DWC OTG driver:
https://dev.openwrt.org/browser/trunk/target/linux/ramips/files/drivers/usb/dwc_otg
Source of IFX driver:
ftp://ftp.avm.de/fritz.box/fritzbox.wlan_3370/x_misc/opensrc/
Thanks,
SztupY
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