include/linux/mc146818rtc.h

1 /* mc146818rtc.h - register definitions for the Real-Time-Clock / CMOS RAM
2  * Copyright Torsten Duwe <duwe@informatik.uni-erlangen.de> 1993
15 #include <linux/rtc.h>			/* get the user-level API */
28  * a separate wakeup alarm used by some almost-clone chips.
57 /* control registers - Moto names
69 /* update-in-progress  - set to "1" 244 microsecs before RTC goes off the bus,
87 # define RTC_SET 0x80		/* disable updates for clock setting */
90 # define RTC_UIE 0x10		/* update-finished interrupt enable */
91 # define RTC_SQWE 0x08		/* enable square-wave output */
93 # define RTC_24H 0x02		/* 24 hour mode - else hours bit 7 means pm */
94 # define RTC_DST_EN 0x01	/* auto switch DST - works f. USA only */
98 /* caution - cleared by read */