I'm looking at the USB code for the iMX31 linux port and I have a question. In the file fsl_otg.c (usb/otg directory) the function fsl_otg_tick_timer has a comment that it's called by a 1mS timer interrupt. However I dont see anything calling this function, or a 1mS usb interrupt. Am I missing some file(s)? Or just missing the appropriate section to look in? Thanks.