MFC r304318, r304464

r304318:
Rename allwinner_machdep.{c.h} to aw_machdep.{c.h} as all allwinner source
files are name aw_*

r304464:
Allwinner: Move a10_padconf.c into a10 subdirectory.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Add a MULTIDELAY option to allow the ARM kernel to have multiple DELAY
implementations. Early in the boot the kernel will use an approximate,
however after the timer has been probed it will switch to a more accurate
implementation.

Reviewed by: manu
Sponsored by: ABT Systems Ltd
Differential Revision: https://reviews.freebsd.org/D5762

Update of the Allwinner drivers to:
* Use the Linux compat string
* Use EARLY_DRIVER_MODULE to attach at the right time
* Add a generic A10 kernel config file
* A20 now use generic_timer
* Add two new dts files for Olimex boards
* Update our custom DTS file for A10 and A20 to use the same compatible
property names as the vendor ones.

Submitted by: Emmanuel Vadot <manu@bidouilliste.com>
Differential Revision: https://reviews.freebsd.org/D4792

Stop using machine/fdt.h in the arm kernel code when we don't need it.

Allow timer0 to run at full 24MHz not at 24MHz/16 by setting prescale to 1.

Approved by: stas (mentor)

Switch to my freebsd.org emal address in copyright.

Approved by: stas (mentor)

Replace many pasted identical definitions of cpu_initclocks() with a common
implementation in arm/machdep.c. Most arm platforms either don't need to
do anything, or just need to call the standard eventtimer init routines.
A generic implementation that does that is now provided via weak linkage.
Any platform that needs to do something different can provide a its own
implementation to override the generic one.

Remove #include <machine/frame.h> from all the arm code that doesn't
really need it. That would be almost everywhere it was included. Add
it in a couple files that really do need it and were previously getting
it by accident via another header.

Bring initial support for Allwinner A20 SoC (Cubieboard2).
Add support for A20 timer.
Correct interrupt offset depending from chip.
Add basic code for CPU configuration module.
For now, add kernel config and dts file
(only FDT blob related problem needs to be solved later in
order to have one kernel for both cubieboard1 and 2).

Approved by: ray@

MFcalloutng:
Switch eventtimers(9) from using struct bintime to sbintime_t.
Even before this not a single driver really supported full dynamic range of
struct bintime even in theory, not speaking about practical inexpediency.
This change legitimates the status quo and cleans up the code.

Fix method of naming compatible string to follow
"<manufacturer>,<model>" as described in
http://www.devicetree.org/Device_Tree_Usage

Reviewed by: andrew@
Approved by: gonzo@

Fix timer to support oneshot and periodic mode
Use 64 bit high and low counter for timecounter and delay

Reviewed by: mav@, ian@
Approved by: gonzo@

Fix formatting of license according to share/examples/etc/bsd-style-copyright

Reviewed by: joel

Fix license to follow standard license template

Reviewed by: joel

Initial support for Allwinner A10 SoC (Cubieboard)
Add simple console driver
Add interrupt handling and timer codes
Add kernel config file
Add dts file
Approved by: gonzo