38  * The RTC's value is the RTT counter plus that offset.  The RTC's alarm
48 #define AT91_RTT_ALMIEN		BIT(16)		/* Alarm Interrupt Enable */
52 #define AT91_RTT_AR		0x04		/* Real-time Alarm Register */
53 #define AT91_RTT_ALMV		(0xffffffff)	/* Alarm Value */
59 #define AT91_RTT_ALMS		BIT(0)		/* Alarm Status */
63  * We store ALARM_DISABLED in ALMV to record that no alarm is set.
133 	u32 offset, alarm, mr;  in at91_rtc_settime()  local
152 	/* adjust the alarm time for the new base */  in at91_rtc_settime()
153 	alarm = rtt_readl(rtc, AR);  in at91_rtc_settime()
154 	if (alarm != ALARM_DISABLED) {  in at91_rtc_settime()
156 			/* time jumped backwards, increase time until alarm */  in at91_rtc_settime()
157 			alarm += (offset - secs);  in at91_rtc_settime()
158 		} else if ((alarm + offset) > secs) {  in at91_rtc_settime()
159 			/* time jumped forwards, decrease time until alarm */  in at91_rtc_settime()
160 			alarm -= (secs - offset);  in at91_rtc_settime()
162 			/* time jumped past the alarm, disable alarm */  in at91_rtc_settime()
163 			alarm = ALARM_DISABLED;  in at91_rtc_settime()
166 		rtt_writel(rtc, AR, alarm);  in at91_rtc_settime()
179 	u32 alarm = rtt_readl(rtc, AR);  in at91_rtc_readalarm()  local
187 	if (alarm != ALARM_DISABLED) {  in at91_rtc_readalarm()
188 		rtc_time64_to_tm(offset + alarm, tm);  in at91_rtc_readalarm()
217 	/* alarm in the past? finish and leave disabled */  in at91_rtc_setalarm()
223 	/* else set alarm and maybe enable it */  in at91_rtc_setalarm()
271 	/* alarm status */  in at91_rtc_cache_events()