1 // SPDX-License-Identifier: GPL-2.0-only
12  * Execute a function while the UIP (Update-in-progress) bit of the RTC is
29 		 * readout is unspecified. The maximum update time is ~2ms. Poll  in mc146818_avoid_UIP()
82  * If the UIP (Update-in-progress) bit of the RTC is set for more then
106 int mc146818_get_time(struct rtc_time *time)  in mc146818_get_time()  argument
112 	bool retry;  in mc146818_get_time()  local
120 		memset(time, 0, sizeof(*time));  in mc146818_get_time()
121 		return -EIO;  in mc146818_get_time()
129 	 * readout is unspecified. The maximum update time is ~2ms. Poll  in mc146818_get_time()
136 	time->tm_sec = CMOS_READ(RTC_SECONDS);  in mc146818_get_time()
145 	if (time->tm_sec != CMOS_READ(RTC_SECONDS)) {  in mc146818_get_time()
154 	 * by the RTC when initially set to a non-zero value.  in mc146818_get_time()
156 	time->tm_min = CMOS_READ(RTC_MINUTES);  in mc146818_get_time()
157 	time->tm_hour = CMOS_READ(RTC_HOURS);  in mc146818_get_time()
158 	time->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);  in mc146818_get_time()
159 	time->tm_mon = CMOS_READ(RTC_MONTH);  in mc146818_get_time()
160 	time->tm_year = CMOS_READ(RTC_YEAR);  in mc146818_get_time()
174 	retry = CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP;  in mc146818_get_time()
181 	retry |= time->tm_sec != CMOS_READ(RTC_SECONDS);  in mc146818_get_time()
185 	if (retry)  in mc146818_get_time()
190 		time->tm_sec = bcd2bin(time->tm_sec);  in mc146818_get_time()
191 		time->tm_min = bcd2bin(time->tm_min);  in mc146818_get_time()
192 		time->tm_hour = bcd2bin(time->tm_hour);  in mc146818_get_time()
193 		time->tm_mday = bcd2bin(time->tm_mday);  in mc146818_get_time()
194 		time->tm_mon = bcd2bin(time->tm_mon);  in mc146818_get_time()
195 		time->tm_year = bcd2bin(time->tm_year);  in mc146818_get_time()
200 	time->tm_year += real_year - 72;  in mc146818_get_time()
204 		time->tm_year += (century - 19) * 100;  in mc146818_get_time()
210 	if (time->tm_year <= 69)  in mc146818_get_time()
211 		time->tm_year += 100;  in mc146818_get_time()
213 	time->tm_mon--;  in mc146818_get_time()
230 /* Set the current date and time in the real time clock. */
231 int mc146818_set_time(struct rtc_time *time)  in mc146818_set_time()  argument
242 	yrs = time->tm_year;  in mc146818_set_time()
243 	mon = time->tm_mon + 1;   /* tm_mon starts at zero */  in mc146818_set_time()
244 	day = time->tm_mday;  in mc146818_set_time()
245 	hrs = time->tm_hour;  in mc146818_set_time()
246 	min = time->tm_min;  in mc146818_set_time()
247 	sec = time->tm_sec;  in mc146818_set_time()
250 		return -EINVAL;  in mc146818_set_time()
260 	 * for non-leap years, so that Feb, 29th is handled  in mc146818_set_time()
264 		real_yrs--;  in mc146818_set_time()
281 		return -EINVAL;  in mc146818_set_time()
284 		yrs -= 100;  in mc146818_set_time()