4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * Date & Time support for the DS12887 RTC
31 #if defined(CONFIG_RTC_DS12887) && defined(CONFIG_CMD_DATE)
33 #define RTC_SECONDS 0x00
34 #define RTC_SECONDS_ALARM 0x01
35 #define RTC_MINUTES 0x02
36 #define RTC_MINUTES_ALARM 0x03
37 #define RTC_HOURS 0x04
38 #define RTC_HOURS_ALARM 0x05
39 #define RTC_DAY_OF_WEEK 0x06
40 #define RTC_DATE_OF_MONTH 0x07
41 #define RTC_MONTH 0x08
43 #define RTC_CONTROL_A 0x0A
44 #define RTC_CONTROL_B 0x0B
45 #define RTC_CONTROL_C 0x0C
46 #define RTC_CONTROL_D 0x0D
48 #define RTC_CA_UIP 0x80
49 #define RTC_CB_DM 0x04
50 #define RTC_CB_24_12 0x02
51 #define RTC_CB_SET 0x80
53 #if defined(CONFIG_ATC)
55 static uchar rtc_read (uchar reg)
59 *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
60 __asm__ __volatile__ ("sync");
62 val = *(volatile unsigned char*)(RTC_PORT_DATA);
66 static void rtc_write (uchar reg, uchar val)
68 *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
69 __asm__ __volatile__ ("sync");
71 *(volatile unsigned char*)(RTC_PORT_DATA) = val;
72 __asm__ __volatile__ ("sync");
76 # error Board specific rtc access functions should be supplied
79 static unsigned bcd2bin (uchar n)
81 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
84 static unsigned char bin2bcd (unsigned int n)
86 return (((n / 10) << 4) | (n % 10));
89 /* ------------------------------------------------------------------------- */
91 int rtc_get (struct rtc_time *tmp)
93 uchar sec, min, hour, mday, wday, mon, year;
95 /* check if rtc is available for access */
96 while( rtc_read(RTC_CONTROL_A) & RTC_CA_UIP)
99 sec = rtc_read(RTC_SECONDS);
100 min = rtc_read(RTC_MINUTES);
101 hour = rtc_read(RTC_HOURS);
102 mday = rtc_read(RTC_DATE_OF_MONTH);
103 wday = rtc_read(RTC_DAY_OF_WEEK);
104 mon = rtc_read(RTC_MONTH);
105 year = rtc_read(RTC_YEAR);
108 printf( "Get RTC year: %d; mon: %d; mday: %d; wday: %d; "
109 "hr: %d; min: %d; sec: %d\n",
110 year, mon, mday, wday, hour, min, sec );
112 printf ( "Alarms: hour: %02x min: %02x sec: %02x\n",
113 rtc_read (RTC_HOURS_ALARM),
114 rtc_read (RTC_MINUTES_ALARM),
115 rtc_read (RTC_SECONDS_ALARM) );
118 if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
119 { /* Information is in BCD format */
120 printf(" Get: Convert BSD to BIN\n");
121 tmp->tm_sec = bcd2bin (sec & 0x7F);
122 tmp->tm_min = bcd2bin (min & 0x7F);
123 tmp->tm_hour = bcd2bin (hour & 0x3F);
124 tmp->tm_mday = bcd2bin (mday & 0x3F);
125 tmp->tm_mon = bcd2bin (mon & 0x1F);
126 tmp->tm_year = bcd2bin (year);
127 tmp->tm_wday = bcd2bin (wday & 0x07);
131 tmp->tm_sec = sec & 0x7F;
132 tmp->tm_min = min & 0x7F;
133 tmp->tm_hour = hour & 0x3F;
134 tmp->tm_mday = mday & 0x3F;
135 tmp->tm_mon = mon & 0x1F;
137 tmp->tm_wday = wday & 0x07;
149 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
150 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
151 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
157 void rtc_set (struct rtc_time *tmp)
160 uchar sec, min, hour, mday, wday, mon, year;
163 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
164 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
165 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
168 if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
169 { /* Information is in BCD format */
170 year = bin2bcd(tmp->tm_year % 100);
171 mon = bin2bcd(tmp->tm_mon);
172 wday = bin2bcd(tmp->tm_wday);
173 mday = bin2bcd(tmp->tm_mday);
174 hour = bin2bcd(tmp->tm_hour);
175 min = bin2bcd(tmp->tm_min);
176 sec = bin2bcd(tmp->tm_sec);
180 year = tmp->tm_year % 100;
189 /* disables the RTC to update the regs */
190 save_ctrl_b = rtc_read(RTC_CONTROL_B);
191 save_ctrl_b |= RTC_CB_SET;
192 rtc_write(RTC_CONTROL_B, save_ctrl_b);
194 rtc_write (RTC_YEAR, year);
195 rtc_write (RTC_MONTH, mon);
196 rtc_write (RTC_DAY_OF_WEEK, wday);
197 rtc_write (RTC_DATE_OF_MONTH, mday);
198 rtc_write (RTC_HOURS, hour);
199 rtc_write (RTC_MINUTES, min);
200 rtc_write (RTC_SECONDS, sec);
202 /* enables the RTC to update the regs */
203 save_ctrl_b &= ~RTC_CB_SET;
204 rtc_write(RTC_CONTROL_B, save_ctrl_b);
207 void rtc_reset (void)
212 ctrl_rg = RTC_CB_SET;
213 rtc_write(RTC_CONTROL_B,ctrl_rg);
215 tmp.tm_year = 1970 % 100;
223 printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
224 tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
225 tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
228 ctrl_rg = RTC_CB_SET | RTC_CB_24_12 | RTC_CB_DM;
229 rtc_write(RTC_CONTROL_B,ctrl_rg);
232 rtc_write(RTC_HOURS_ALARM, 0),
233 rtc_write(RTC_MINUTES_ALARM, 0),
234 rtc_write(RTC_SECONDS_ALARM, 0);
236 ctrl_rg = RTC_CB_24_12 | RTC_CB_DM;
237 rtc_write(RTC_CONTROL_B,ctrl_rg);