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AM3517: high-speed USB subsystem initialization for OHCI mode
Hi all,I have to initialize port A (1) and port C (2) of high-speed USB subsystem of AM3517 in order to interface 2 external 6-pin serial transceivers (TI TUSB1105). Port 3 is not used. Operating system is Linux 2.6.31-rc7 (PSP 03.00.00.02). Since this working mode is not supported by PSP, I had to write a new device driver. As starting point I used the omap-echi driver. I'm facing the following problem when initializing TLL_CHANNEL_CONFIG_0 register.Before writing this register (see this image http://www.dave.eu/download/tmp/sitara/usbtll-preinit.png), USBTLL_SYSSTATUS register reports "Reset is done" as expected (this is shown on window data.dump a:0x48062000 that refers to TLL registers memory region). As soon as TLL_CHANNEL_CONFIG_0 is written with value 0x184DB, TLL module enters reset state and never gets out of it (see http://www.dave.eu/download/tmp/sitara/usbtll-postinit.png).So I suspect I'm missing something in channel initialization.My configuration is pretty similar to the one described here:http://e2e.ti.com/support/arm174_microprocessors/omap_applications_processors/f/42/t/28622.aspxThe major differences are:1) I'm using port 1 and 2 in OHCI mode while Danny P sets up port 1 in EHCI, port 2 in OHCI and port 3 in OHCI2) we are working with Linux while it seems Danny P used WinCE3) we are working with AM3517 while Danny P worked with OMAP3515 but, as far as we know, the High-speed USB subsystem is the same.Anybody experienced similar problems?Thanks a lot in advance.
Does the PSP now support OHCI for the AM3715? The ECHI to OHCI errata has forced us to use this route so we are also looking at using the OCHI controller and the TI TUSB1105 PHY. But will the PSP support this mode?
Can we have confirmation of this before we change the hardware again?
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