10  * SPDX-License-Identifier:	GPL-2.0+
14  * STMicroelectronics M41T60 serial access real-time clock
28  * assume years are in the range 1900 - 2299.
46  * verbose.  DAY/DATE aren't nice but that is how they are on the data sheet.
63 	uchar data[8];  in rtc_dump()  local
65 	if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, data, sizeof(data))) {  in rtc_dump()
69 	printf("RTC dump %s: %02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X\n",  in rtc_dump()
70 	       label, data[0], data[1], data[2], data[3],  in rtc_dump()
71 	       data[4], data[5], data[6], data[7]);  in rtc_dump()
81 	 * determine whether there has been an initial power-up since the last  in rtc_validate()
90 	static uchar data[8];  in rtc_validate()  local
94 	if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, data, sizeof(data))) {  in rtc_validate()
100 	 * oscillator so it can be "kick-started" as per data sheet.  in rtc_validate()
102 	if (0x00 != (data[RTC_CTRL] & 0x80)) {  in rtc_validate()
104 		data[RTC_SEC] = 0x80;  in rtc_validate()
105 		if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC, 1, data, 1)) {  in rtc_validate()
114 	min = data[RTC_MIN] & 0x7F;  in rtc_validate()
115 	date = data[RTC_DATE];  in rtc_validate()
116 	month = data[RTC_MONTH] & 0x3F;  in rtc_validate()
117 	years = data[RTC_YEAR];  in rtc_validate()
118 	if (0x59 < data[RTC_SEC] || 0x09 < (data[RTC_SEC] & 0x0F) ||  in rtc_validate()
120 	    0x23 < data[RTC_HOUR] || 0x09 < (data[RTC_HOUR] & 0x0F) ||  in rtc_validate()
121 	    0x07 < data[RTC_DAY] || 0x00 == data[RTC_DAY] ||  in rtc_validate()
127 	      (0x00 == years && 0x00 != (data[RTC_MONTH] & 0xC0))))) {  in rtc_validate()
130 		 * Set to 00:00:00 1900-01-01 (Monday)  in rtc_validate()
132 		data[RTC_SEC] = 0x00;  in rtc_validate()
133 		data[RTC_MIN] &= 0x80;	/* preserve OFIE bit */  in rtc_validate()
134 		data[RTC_HOUR] = 0x00;  in rtc_validate()
135 		data[RTC_DAY] = 0x02;  in rtc_validate()
136 		data[RTC_DATE] = 0x01;  in rtc_validate()
137 		data[RTC_MONTH] = 0xC1;  in rtc_validate()
138 		data[RTC_YEAR] = 0x00;  in rtc_validate()
139 		data[RTC_CTRL] &= 0x7F;	/* reset OUT bit */  in rtc_validate()
141 		if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, data, sizeof(data))) {  in rtc_validate()
146 	return data;  in rtc_validate()
151 	uchar const *const data = rtc_validate();  in rtc_get()  local
153 	if (!data)  in rtc_get()
154 		return -1;  in rtc_get()
156 	tmp->tm_sec = bcd2bin(data[RTC_SEC] & 0x7F);  in rtc_get()
157 	tmp->tm_min = bcd2bin(data[RTC_MIN] & 0x7F);  in rtc_get()
158 	tmp->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3F);  in rtc_get()
159 	tmp->tm_mday = bcd2bin(data[RTC_DATE] & 0x3F);  in rtc_get()
160 	tmp->tm_mon = bcd2bin(data[RTC_MONTH] & 0x1F);  in rtc_get()
161 	tmp->tm_year = cb2year(data[RTC_MONTH] >> 6) + bcd2bin(data[RTC_YEAR]);  in rtc_get()
162 	tmp->tm_wday = bcd2bin(data[RTC_DAY] & 0x07) - 1;  in rtc_get()
163 	tmp->tm_yday = 0;  in rtc_get()
164 	tmp->tm_isdst = 0;  in rtc_get()
166 	debug("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",  in rtc_get()
167 	      tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,  in rtc_get()
168 	      tmp->tm_hour, tmp->tm_min, tmp->tm_sec);  in rtc_get()
175 	uchar *const data = rtc_validate();  in rtc_set()  local
177 	if (!data)  in rtc_set()
178 		return -1;  in rtc_set()
180 	debug("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",  in rtc_set()
181 	      tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,  in rtc_set()
182 	      tmp->tm_hour, tmp->tm_min, tmp->tm_sec);  in rtc_set()
184 	data[RTC_SEC] = (data[RTC_SEC] & 0x80) | (bin2bcd(tmp->tm_sec) & 0x7F);  in rtc_set()
185 	data[RTC_MIN] = (data[RTC_MIN] & 0X80) | (bin2bcd(tmp->tm_min) & 0X7F);  in rtc_set()
186 	data[RTC_HOUR] = bin2bcd(tmp->tm_hour) & 0x3F;  in rtc_set()
187 	data[RTC_DATE] = bin2bcd(tmp->tm_mday) & 0x3F;  in rtc_set()
188 	data[RTC_MONTH] = bin2bcd(tmp->tm_mon) & 0x1F;  in rtc_set()
189 	data[RTC_YEAR] = bin2bcd(tmp->tm_year % 100);  in rtc_set()
190 	data[RTC_MONTH] |= year2cb(tmp->tm_year) << 6;  in rtc_set()
191 	data[RTC_DAY] = bin2bcd(tmp->tm_wday + 1) & 0x07;  in rtc_set()
192 	if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, data, RTC_REG_CNT)) {  in rtc_set()
194 		return -1;  in rtc_set()
202 	uchar *const data = rtc_validate();  in rtc_reset()  local
205 	if (!data)  in rtc_reset()
211 	 * between 0x00 and 0x3F, inclusive.  The five least-significan bits  in rtc_reset()
221 			if ((data[RTC_CTRL] & 0x3F) != l) {  in rtc_reset()
224 				data[RTC_CTRL] &= 0xC0;  in rtc_reset()
225 				data[RTC_CTRL] |= (uchar) l;  in rtc_reset()
234 	data[RTC_CTRL] &= 0xBF;  in rtc_reset()
235 	if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_CTRL, 1, data + RTC_CTRL, 1)) {  in rtc_reset()