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usb-ehci: trace mmio and usbsts
This patch starts adding trace support to ehci. It tracesupdates of the status register (USBSTS), mmio access andcontroller reset.
It also adds functions to set and clear status register bitsand puts them in use everywhere....
usb: add ehci adapter
This patch finally merges the EHCI host adapter aka USB 2.0 support.
Based on the ehci bits collected @ git://git.kiszka.org/qemu.git ehci
EHCI has a long out-of-tree history. Project was started by MarkBurkley, with contributions by Niels de Vos. David S. Ahern continued...