- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix LOW and FULL speed USB INTERRUPT endpoint support for the
DWC OTG driver. Fix a hang issue when using LOW and FULL speed
BULK traffic. Make sure we don't ask for data in the last
microframe. This allows using devices like USB mice and USB
keyboards connected to the RPI-B.

Suggested by: gonzo @

Make sure we record NAK tokens in the TD structure for IN direction.
Improve host channel disabling. Wait two times 125us for channel to be
disabled. The DWC OTG doesn't like when channels are re-used too early.

Make sure the DWC OTG host mode channels are given enough time to disable.

DWC OTG host mode improvements. Add support for the 3-strikes and you are
gone rule. Optimise use of channels so that when a channel
is not ready another channel is used. Instead of using the SOF interrupt
use the system timer to drive the host statemachine. This might
give lower throughput and higher latency, but reduces the CPU usage
significantly. The DWC OTG host mode support should not be considered
for serious USB host controller applications. Some problems are still
seen with LOW speed USB devices.

DWC OTG improvements. Implement full support for SPLIT transactions, in other
words FULL/LOW speed devices through HIGH speed HUBs. Improve support for
suspend and resume in host mode.

Fix TX FIFO sizes. Correct FIFO handling in Host mode.

Reduce DWC OTG polling rate by using the SOF interrupt.

Fix missing parts of DWC OTG host mode support. The host mode support
of the DWC OTG is very simple in PIO mode, and we need to re-transmit
data when NAK is received among other things. We probably will need
to implement some kind of rate limitation on the NAK-ing.

Cleanup interrupt handling in Host Mode.

Add support for host mode to the DWC OTG controller driver.
The DWC OTG host mode support should still be considered
experimental. Isochronous support for DWC OTG is not
fully implemented. Some code added derives from
Aleksandr Rybalko's dotg.c driver.

Preparations for adding USB HOST mode to the DWC OTG driver.
Merge register file with external one and put all register
definitions in a separate file.

Submitted by: ray @

Fix for DWC OTG interrupt register programming.
Fix a compiler warning.
Add missing header file.

MFC after: 1 week

Add support for the DesignWare USB 2.0 OTG controller chipset.
Currently the code is not built by any modules. That will
be fixed later. The Atmel ARM bus interface file part of this
commit is just for sake of example. All registers and bits are
declared like macros and not C-structures like in official
Synopsis header files. This driver mostly origins from the
musb_otg.c driver in FreeBSD except that the chip specific
programming has been replaced by the one for DWC 2.0 USB OTG.
Some parts related to system suspend and resume have been left
like empty functions for the future. USB suspend and resume is
fully supported.