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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/rtc/ds12887.c
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_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 int rtc_get (struct rtc_time
*tmp
)
81 uchar sec
, min
, hour
, mday
, wday
, mon
, year
;
83 /* check if rtc is available for access */
84 while( rtc_read(RTC_CONTROL_A
) & RTC_CA_UIP
)
87 sec
= rtc_read(RTC_SECONDS
);
88 min
= rtc_read(RTC_MINUTES
);
89 hour
= rtc_read(RTC_HOURS
);
90 mday
= rtc_read(RTC_DATE_OF_MONTH
);
91 wday
= rtc_read(RTC_DAY_OF_WEEK
);
92 mon
= rtc_read(RTC_MONTH
);
93 year
= rtc_read(RTC_YEAR
);
96 printf( "Get RTC year: %d; mon: %d; mday: %d; wday: %d; "
97 "hr: %d; min: %d; sec: %d\n",
98 year
, mon
, mday
, wday
, hour
, min
, sec
);
100 printf ( "Alarms: hour: %02x min: %02x sec: %02x\n",
101 rtc_read (RTC_HOURS_ALARM
),
102 rtc_read (RTC_MINUTES_ALARM
),
103 rtc_read (RTC_SECONDS_ALARM
) );
106 if( !(rtc_read(RTC_CONTROL_B
) & RTC_CB_DM
))
107 { /* Information is in BCD format */
108 printf(" Get: Convert BSD to BIN\n");
109 tmp
->tm_sec
= bcd2bin (sec
& 0x7F);
110 tmp
->tm_min
= bcd2bin (min
& 0x7F);
111 tmp
->tm_hour
= bcd2bin (hour
& 0x3F);
112 tmp
->tm_mday
= bcd2bin (mday
& 0x3F);
113 tmp
->tm_mon
= bcd2bin (mon
& 0x1F);
114 tmp
->tm_year
= bcd2bin (year
);
115 tmp
->tm_wday
= bcd2bin (wday
& 0x07);
119 tmp
->tm_sec
= sec
& 0x7F;
120 tmp
->tm_min
= min
& 0x7F;
121 tmp
->tm_hour
= hour
& 0x3F;
122 tmp
->tm_mday
= mday
& 0x3F;
123 tmp
->tm_mon
= mon
& 0x1F;
125 tmp
->tm_wday
= wday
& 0x07;
137 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
138 tmp
->tm_year
, tmp
->tm_mon
, tmp
->tm_mday
, tmp
->tm_wday
,
139 tmp
->tm_hour
, tmp
->tm_min
, tmp
->tm_sec
);
145 int rtc_set (struct rtc_time
*tmp
)
148 uchar sec
, min
, hour
, mday
, wday
, mon
, year
;
151 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
152 tmp
->tm_year
, tmp
->tm_mon
, tmp
->tm_mday
, tmp
->tm_wday
,
153 tmp
->tm_hour
, tmp
->tm_min
, tmp
->tm_sec
);
156 if( !(rtc_read(RTC_CONTROL_B
) & RTC_CB_DM
))
157 { /* Information is in BCD format */
158 year
= bin2bcd(tmp
->tm_year
% 100);
159 mon
= bin2bcd(tmp
->tm_mon
);
160 wday
= bin2bcd(tmp
->tm_wday
);
161 mday
= bin2bcd(tmp
->tm_mday
);
162 hour
= bin2bcd(tmp
->tm_hour
);
163 min
= bin2bcd(tmp
->tm_min
);
164 sec
= bin2bcd(tmp
->tm_sec
);
168 year
= tmp
->tm_year
% 100;
177 /* disables the RTC to update the regs */
178 save_ctrl_b
= rtc_read(RTC_CONTROL_B
);
179 save_ctrl_b
|= RTC_CB_SET
;
180 rtc_write(RTC_CONTROL_B
, save_ctrl_b
);
182 rtc_write (RTC_YEAR
, year
);
183 rtc_write (RTC_MONTH
, mon
);
184 rtc_write (RTC_DAY_OF_WEEK
, wday
);
185 rtc_write (RTC_DATE_OF_MONTH
, mday
);
186 rtc_write (RTC_HOURS
, hour
);
187 rtc_write (RTC_MINUTES
, min
);
188 rtc_write (RTC_SECONDS
, sec
);
190 /* enables the RTC to update the regs */
191 save_ctrl_b
&= ~RTC_CB_SET
;
192 rtc_write(RTC_CONTROL_B
, save_ctrl_b
);
197 void rtc_reset (void)
202 ctrl_rg
= RTC_CB_SET
;
203 rtc_write(RTC_CONTROL_B
,ctrl_rg
);
205 tmp
.tm_year
= 1970 % 100;
213 printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
214 tmp
.tm_year
, tmp
.tm_mon
, tmp
.tm_mday
,
215 tmp
.tm_hour
, tmp
.tm_min
, tmp
.tm_sec
);
218 ctrl_rg
= RTC_CB_SET
| RTC_CB_24_12
| RTC_CB_DM
;
219 rtc_write(RTC_CONTROL_B
,ctrl_rg
);
222 rtc_write(RTC_HOURS_ALARM
, 0),
223 rtc_write(RTC_MINUTES_ALARM
, 0),
224 rtc_write(RTC_SECONDS_ALARM
, 0);
226 ctrl_rg
= RTC_CB_24_12
| RTC_CB_DM
;
227 rtc_write(RTC_CONTROL_B
,ctrl_rg
);