6  * SPDX-License-Identifier:	GPL-2.0+
15  * It is a serial real-time clock which provides
16  * 1)Low-power clock/calendar.
17  * 2)Programmable square-wave output.
27 #define RTC_SEC_REG_ADDR        0x0
28 #define RTC_MIN_REG_ADDR        0x1
29 #define RTC_HR_REG_ADDR         0x2
30 #define RTC_DAY_REG_ADDR        0x3
31 #define RTC_DATE_REG_ADDR       0x4
32 #define RTC_MON_REG_ADDR        0x5
33 #define RTC_YR_REG_ADDR         0x6
34 #define RTC_CTL_STAT_REG_ADDR   0x7
37 #define RTC_SEC_BIT_CH		0x80	/* Clock Halt (in Register 0) */
40 #define RTC_CTL_STAT_BIT_RS0    0x1	/* Rate select 0 */
41 #define RTC_CTL_STAT_BIT_RS1    0x2	/* Rate select 1 */
42 #define RTC_CTL_STAT_BIT_SQWE   0x10	/* Square Wave Enable */
43 #define RTC_CTL_STAT_BIT_OSF    0x20	/* Oscillator Stop Flag */
44 #define RTC_CTL_STAT_BIT_OUT    0x80	/* Output Level Control */
65 	int ret = 0;  in rtc_get()
66 	u8 sec, min, hour, mday, wday, mon, year, ctl_stat;  in rtc_get()  local
74 	mon = rtc_read(RTC_MON_REG_ADDR);  in rtc_get()
76 	debug("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "  in rtc_get()
78 		year, mon, mday, wday, hour, min, sec, ctl_stat);  in rtc_get()
86 		ret = -1;  in rtc_get()
89 	tmp->tm_sec = bcd2bin(sec & 0x7F);  in rtc_get()
90 	tmp->tm_min = bcd2bin(min & 0x7F);  in rtc_get()
91 	tmp->tm_hour = bcd2bin(hour & 0x3F);  in rtc_get()
92 	tmp->tm_mday = bcd2bin(mday & 0x3F);  in rtc_get()
93 	tmp->tm_mon = bcd2bin(mon & 0x1F);  in rtc_get()
94 	tmp->tm_year = bcd2bin(year) + 2000;  in rtc_get()
95 	tmp->tm_wday = bcd2bin((wday - 1) & 0x07);  in rtc_get()
96 	tmp->tm_yday = 0;  in rtc_get()
97 	tmp->tm_isdst = 0;  in rtc_get()
98 	debug("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",  in rtc_get()
99 		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,  in rtc_get()
100 		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);  in rtc_get()
108 	debug("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",  in rtc_set()
109 		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,  in rtc_set()
110 		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);  in rtc_set()
112 	rtc_write(RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100));  in rtc_set()
113 	rtc_write(RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon));  in rtc_set()
114 	rtc_write(RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday + 1));  in rtc_set()
115 	rtc_write(RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday));  in rtc_set()
116 	rtc_write(RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour));  in rtc_set()
117 	rtc_write(RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min));  in rtc_set()
118 	rtc_write(RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec));  in rtc_set()
120 	return 0;  in rtc_set()
126 	rtc_write(RTC_SEC_REG_ADDR, 0x00);	/* clearing Clock Halt	*/  in rtc_reset()