rtc: add platform driver for EFI

Munge Stephane Eranian's efirtc.c code into an rtc platform driver

[akpm@linux-foundation.org: use is_leap_year()]
Signed-off-by: dann frazier <dannf@hp.com>
Cc: Alessandro Zummo <alessandro.zummo@towertech.it>
Cc: stephane eranian <eranian@googlemail.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/Kconfig

@@ -440,6 +440,16 @@ config RTC_DRV_DS1742
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-ds1742.
 
+config RTC_DRV_EFI
+	tristate "EFI RTC"
+	depends on IA64
+	help
+	  If you say yes here you will get support for the EFI
+	  Real Time Clock.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-efi.
+
 config RTC_DRV_STK17TA8
 	tristate "Simtek STK17TA8"
 	depends on RTC_CLASS