Timer: Remove reset_timer() for non-Nios2 arches
[oweals/u-boot.git] / drivers / rtc / ds12887.c
1 /*
2  * (C) Copyright 2003
3  *
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.
8  *
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.
13  *
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,
17  * MA 02111-1307 USA
18  */
19
20 /*
21  * Date & Time support for the DS12887 RTC
22  */
23
24 #undef  RTC_DEBUG
25
26 #include <common.h>
27 #include <command.h>
28 #include <config.h>
29 #include <rtc.h>
30
31 #if defined(CONFIG_CMD_DATE)
32
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
42 #define RTC_YEAR                        0x09
43 #define RTC_CONTROL_A                   0x0A
44 #define RTC_CONTROL_B                   0x0B
45 #define RTC_CONTROL_C                   0x0C
46 #define RTC_CONTROL_D                   0x0D
47
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
52
53 #if defined(CONFIG_ATC)
54
55 static uchar rtc_read (uchar reg)
56 {
57         uchar val;
58
59         *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
60         __asm__ __volatile__ ("sync");
61
62         val = *(volatile unsigned char*)(RTC_PORT_DATA);
63         return (val);
64 }
65
66 static void rtc_write (uchar reg, uchar val)
67 {
68         *(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
69         __asm__ __volatile__ ("sync");
70
71         *(volatile unsigned char*)(RTC_PORT_DATA) = val;
72         __asm__ __volatile__ ("sync");
73 }
74
75 #else
76 # error Board specific rtc access functions should be supplied
77 #endif
78
79 int rtc_get (struct rtc_time *tmp)
80 {
81         uchar sec, min, hour, mday, wday, mon, year;
82
83         /* check if rtc is available for access */
84         while( rtc_read(RTC_CONTROL_A) & RTC_CA_UIP)
85                 ;
86
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);
94
95 #ifdef RTC_DEBUG
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 );
99
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) );
104 #endif
105
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);
116         }
117 else
118         {
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;
124                 tmp->tm_year = year;
125                 tmp->tm_wday = wday & 0x07;
126         }
127
128
129         if(tmp->tm_year<70)
130                 tmp->tm_year+=2000;
131         else
132                 tmp->tm_year+=1900;
133
134         tmp->tm_yday = 0;
135         tmp->tm_isdst= 0;
136 #ifdef RTC_DEBUG
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);
140 #endif
141
142         return 0;
143 }
144
145 int rtc_set (struct rtc_time *tmp)
146 {
147         uchar save_ctrl_b;
148         uchar sec, min, hour, mday, wday, mon, year;
149
150 #ifdef RTC_DEBUG
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);
154 #endif
155
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);
165         }
166         else
167         {
168                 year = tmp->tm_year % 100;
169                 mon  = tmp->tm_mon;
170                 wday = tmp->tm_wday;
171                 mday = tmp->tm_mday;
172                 hour = tmp->tm_hour;
173                 min  = tmp->tm_min;
174                 sec  = tmp->tm_sec;
175         }
176
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);
181
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);
189
190         /* enables the RTC to update the regs */
191         save_ctrl_b &= ~RTC_CB_SET;
192         rtc_write(RTC_CONTROL_B, save_ctrl_b);
193
194         return 0;
195 }
196
197 void rtc_reset (void)
198 {
199         struct rtc_time tmp;
200         uchar ctrl_rg;
201
202         ctrl_rg = RTC_CB_SET;
203         rtc_write(RTC_CONTROL_B,ctrl_rg);
204
205         tmp.tm_year = 1970 % 100;
206         tmp.tm_mon = 1;
207         tmp.tm_mday= 1;
208         tmp.tm_hour = 0;
209         tmp.tm_min = 0;
210         tmp.tm_sec = 0;
211
212 #ifdef RTC_DEBUG
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);
216 #endif
217
218         ctrl_rg = RTC_CB_SET | RTC_CB_24_12 | RTC_CB_DM;
219         rtc_write(RTC_CONTROL_B,ctrl_rg);
220         rtc_set(&tmp);
221
222         rtc_write(RTC_HOURS_ALARM, 0),
223         rtc_write(RTC_MINUTES_ALARM, 0),
224         rtc_write(RTC_SECONDS_ALARM, 0);
225
226         ctrl_rg = RTC_CB_24_12 | RTC_CB_DM;
227         rtc_write(RTC_CONTROL_B,ctrl_rg);
228 }
229
230 #endif