4 * SPDX-License-Identifier: GPL-2.0+
8 * Date & Time support for the DS12887 RTC
18 #if defined(CONFIG_CMD_DATE)
20 #define RTC_SECONDS 0x00
21 #define RTC_SECONDS_ALARM 0x01
22 #define RTC_MINUTES 0x02
23 #define RTC_MINUTES_ALARM 0x03
24 #define RTC_HOURS 0x04
25 #define RTC_HOURS_ALARM 0x05
26 #define RTC_DAY_OF_WEEK 0x06
27 #define RTC_DATE_OF_MONTH 0x07
28 #define RTC_MONTH 0x08
30 #define RTC_CONTROL_A 0x0A
31 #define RTC_CONTROL_B 0x0B
32 #define RTC_CONTROL_C 0x0C
33 #define RTC_CONTROL_D 0x0D
35 #define RTC_CA_UIP 0x80
36 #define RTC_CB_DM 0x04
37 #define RTC_CB_24_12 0x02
38 #define RTC_CB_SET 0x80
40 #if defined(CONFIG_ATC)
42 static uchar rtc_read (uchar reg)
46 *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
47 __asm__ __volatile__ ("sync");
49 val = *(volatile unsigned char*)(RTC_PORT_DATA);
53 static void rtc_write (uchar reg, uchar val)
55 *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
56 __asm__ __volatile__ ("sync");
58 *(volatile unsigned char*)(RTC_PORT_DATA) = val;
59 __asm__ __volatile__ ("sync");
63 # error Board specific rtc access functions should be supplied
66 int rtc_get (struct rtc_time *tmp)
68 uchar sec, min, hour, mday, wday, mon, year;
70 /* check if rtc is available for access */
71 while( rtc_read(RTC_CONTROL_A) & RTC_CA_UIP)
74 sec = rtc_read(RTC_SECONDS);
75 min = rtc_read(RTC_MINUTES);
76 hour = rtc_read(RTC_HOURS);
77 mday = rtc_read(RTC_DATE_OF_MONTH);
78 wday = rtc_read(RTC_DAY_OF_WEEK);
79 mon = rtc_read(RTC_MONTH);
80 year = rtc_read(RTC_YEAR);
83 printf( "Get RTC year: %d; mon: %d; mday: %d; wday: %d; "
84 "hr: %d; min: %d; sec: %d\n",
85 year, mon, mday, wday, hour, min, sec );
87 printf ( "Alarms: hour: %02x min: %02x sec: %02x\n",
88 rtc_read (RTC_HOURS_ALARM),
89 rtc_read (RTC_MINUTES_ALARM),
90 rtc_read (RTC_SECONDS_ALARM) );
93 if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
94 { /* Information is in BCD format */
95 printf(" Get: Convert BSD to BIN\n");
96 tmp->tm_sec = bcd2bin (sec & 0x7F);
97 tmp->tm_min = bcd2bin (min & 0x7F);
98 tmp->tm_hour = bcd2bin (hour & 0x3F);
99 tmp->tm_mday = bcd2bin (mday & 0x3F);
100 tmp->tm_mon = bcd2bin (mon & 0x1F);
101 tmp->tm_year = bcd2bin (year);
102 tmp->tm_wday = bcd2bin (wday & 0x07);
106 tmp->tm_sec = sec & 0x7F;
107 tmp->tm_min = min & 0x7F;
108 tmp->tm_hour = hour & 0x3F;
109 tmp->tm_mday = mday & 0x3F;
110 tmp->tm_mon = mon & 0x1F;
112 tmp->tm_wday = wday & 0x07;
124 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
125 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
126 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
132 int rtc_set (struct rtc_time *tmp)
135 uchar sec, min, hour, mday, wday, mon, year;
138 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
139 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
140 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
143 if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
144 { /* Information is in BCD format */
145 year = bin2bcd(tmp->tm_year % 100);
146 mon = bin2bcd(tmp->tm_mon);
147 wday = bin2bcd(tmp->tm_wday);
148 mday = bin2bcd(tmp->tm_mday);
149 hour = bin2bcd(tmp->tm_hour);
150 min = bin2bcd(tmp->tm_min);
151 sec = bin2bcd(tmp->tm_sec);
155 year = tmp->tm_year % 100;
164 /* disables the RTC to update the regs */
165 save_ctrl_b = rtc_read(RTC_CONTROL_B);
166 save_ctrl_b |= RTC_CB_SET;
167 rtc_write(RTC_CONTROL_B, save_ctrl_b);
169 rtc_write (RTC_YEAR, year);
170 rtc_write (RTC_MONTH, mon);
171 rtc_write (RTC_DAY_OF_WEEK, wday);
172 rtc_write (RTC_DATE_OF_MONTH, mday);
173 rtc_write (RTC_HOURS, hour);
174 rtc_write (RTC_MINUTES, min);
175 rtc_write (RTC_SECONDS, sec);
177 /* enables the RTC to update the regs */
178 save_ctrl_b &= ~RTC_CB_SET;
179 rtc_write(RTC_CONTROL_B, save_ctrl_b);
184 void rtc_reset (void)
189 ctrl_rg = RTC_CB_SET;
190 rtc_write(RTC_CONTROL_B,ctrl_rg);
192 tmp.tm_year = 1970 % 100;
200 printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
201 tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
202 tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
205 ctrl_rg = RTC_CB_SET | RTC_CB_24_12 | RTC_CB_DM;
206 rtc_write(RTC_CONTROL_B,ctrl_rg);
209 rtc_write(RTC_HOURS_ALARM, 0),
210 rtc_write(RTC_MINUTES_ALARM, 0),
211 rtc_write(RTC_SECONDS_ALARM, 0);
213 ctrl_rg = RTC_CB_24_12 | RTC_CB_DM;
214 rtc_write(RTC_CONTROL_B,ctrl_rg);