adding vrtc driver for x86/mrst platform

From: Feng Tang <[email protected]>

Hi all,

Moorestown platform doesn't have a m146818 RTC device like traditional x86 PC, but a firmware emulated virtual RTC device(vrtc), which provides some basic RTC functions like get/set time. vrtc serves as the only wall clock device on Moorestown platform.

Currently, vrtc init func need be called before xtime's init, thus move xtime's init into a subsys_initcall: timekeeping_late_init() as suggested by Thomas

Please review these patches.

Thanks,
Feng

Changelog:

	v2:
	    * add IPC cmd for setting time

---------------
Feng Tang (3):
timekeeping: moving xtime's init to a later time
x86: unify current 3 similar ways of saving IRQ info x86/mrst: add vrtc driver which serves as a wall clock device

 arch/x86/include/asm/mpspec.h |    6 ++
 arch/x86/include/asm/mrst.h   |    2 -
 arch/x86/include/asm/vrtc.h   |   24 ++++++
 arch/x86/kernel/Makefile      |    2 +-
 arch/x86/kernel/acpi/boot.c   |   32 +-------
 arch/x86/kernel/mpparse.c     |   14 ++--
 arch/x86/kernel/mrst.c        |   72 +------------------
 arch/x86/kernel/vrtc.c        |  164 +++++++++++++++++++++++++++++++++++++++++
 kernel/time/timekeeping.c     |   28 +++++--
 9 files changed, 227 insertions(+), 117 deletions(-)
 create mode 100644 arch/x86/include/asm/vrtc.h
 create mode 100644 arch/x86/kernel/vrtc.c