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OMAP 4430 HSUSB EHCI issue

Rajesh Venkataraman
Prodigy 10 points

I am trying to write a EHCI driver for the omap 44430 using the Panda board. We are not using linux and other standard OS. We are using our own proprietary OS. I am trying to get the USB HOST port talk to the HUB and eventually setup the ethernet port on the Panda Board. I have enabled clock to the HSUSB module and set up the pin mux for the Port 1 as usbphy. Setup the AUX clock for the PHY. Initialized the the ehci registers and enabled the ehci interrupt.. After enabling the power to the HUB I get a Connect Status Change interrupt. The Port Reset bit in the PORTSC Set and Cleared after a delay. Now in the PORTSC the PED bit(Port Enabled/Disabled)is set. The Control QH is set up with QTDs and the QH address is set in the ASYNCLISTADDR register. But as soon as I set the ASE bit in the USBCMD register the ASYNCLISTADDR register contents change to 0x1E100C00. The USBSTS has the ASS bit and the REC bit set. But I do not get any interrupt. The QTDs are still active. What are the reasons for the ASYNCLISTADDR register to get corrupted on enabling the Async scheduling in the EHCI controller. I don't know If I have setup all the clocks correctly.

Here is a Dump of all the EHCI registers

{HCCAPBASE = 0x1000010, HCSPARAMS = 0x1313, HCCPARAMS = 0x20016, Resvered0 = 0x0, USBCMD = 0x80b29, USBSTS = 0xa008, USBINTR = 0x27,
  FRINDEX = 0x18e, CTRLDSSEGMENT = 0x0, PERIODICLISTBASE = 0x81990000, ASYNCLISTADDR = 0x1e100c00, Resvered1 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
    0x0, 0x0}, CONFIGFLAG = 0x1, PORTSC = {0x1007, 0x0 <repeats 14 times>}, INSNREG00 = 0x0, INSNREG01 = 0x200020, INSNREG02 = 0x80,
  INSNREG03 = 0x1, INSNREG04 = 0x0, INSNREG05_ULPI = 0x0, INSNREG06 = 0x0, INSNREG07 = 0x0, INSNREG08 = 0x0}

Any help with this issue would be great.

Adding more info to my previous question.

The CM_L3INIT_CLKSTCTRL (0x4a009300) has a bit indicating the status of the Clock CLKACTIVITY_USB_DPLL_HS_CLK (bit 15). This bit is not set on my setup. Is this clock necessary for the EHCI controller to work? How can I enable this clock. Is there any document explaining how to enable this clock?

  • 0
    TI__Genius 15005 points

    I think you haven't turned on any of the functional clocks needed for the USBHOST. These are controlled using the CM_L3INIT_HSUSBHOST_CLKCTRL register (Address 0x4A009358). This register is documented in the OMAP4430 TRM available here <http://www.ti.com/product/omap4430#technicaldocuments>.

    I’ve attached a list of registers that potentially affect EHCI. If you send me the values of these registers in your setup, I'd be happy to review them for you.

    Alternatively, you could simply read the same registers on a Pandaboard running Linux and compare it with what you have.

    1856.usb_prcm.txt