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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-ehci: trace state machine changes
Add functions to get and set the current state of the state machine,add tracepoints there to trace state transitions. Add support fortraceing the queue heads and transfer descriptors as we look at them.
Drop a few DPRINTFs and all DPRINTF_ST lines, they are obsolete now....
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...