1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* (C) Copyright 2003
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* Date & Time support for the DS12887 RTC
*/
#undef RTC_DEBUG
#include <common.h>
#include <command.h>
#include <config.h>
#include <rtc.h>
#if defined(CONFIG_RTC_DS12887) && (CONFIG_COMMANDS & CFG_CMD_DATE)
#define RTC_SECONDS 0x00
#define RTC_SECONDS_ALARM 0x01
#define RTC_MINUTES 0x02
#define RTC_MINUTES_ALARM 0x03
#define RTC_HOURS 0x04
#define RTC_HOURS_ALARM 0x05
#define RTC_DAY_OF_WEEK 0x06
#define RTC_DATE_OF_MONTH 0x07
#define RTC_MONTH 0x08
#define RTC_YEAR 0x09
#define RTC_CONTROL_A 0x0A
#define RTC_CONTROL_B 0x0B
#define RTC_CONTROL_C 0x0C
#define RTC_CONTROL_D 0x0D
#define RTC_CA_UIP 0x80
#define RTC_CB_DM 0x04
#define RTC_CB_24_12 0x02
#define RTC_CB_SET 0x80
#if defined(CONFIG_ATC)
static uchar rtc_read (uchar reg)
{
uchar val;
*(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
__asm__ __volatile__ ("sync");
val = *(volatile unsigned char*)(RTC_PORT_DATA);
return (val);
}
static void rtc_write (uchar reg, uchar val)
{
*(volatile unsigned char*)(RTC_PORT_ADDR) = reg;
__asm__ __volatile__ ("sync");
*(volatile unsigned char*)(RTC_PORT_DATA) = val;
__asm__ __volatile__ ("sync");
}
#else
# error Board specific rtc access functions should be supplied
#endif
static unsigned bcd2bin (uchar n)
{
return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
}
static unsigned char bin2bcd (unsigned int n)
{
return (((n / 10) << 4) | (n % 10));
}
/* ------------------------------------------------------------------------- */
void rtc_get (struct rtc_time *tmp)
{
uchar sec, min, hour, mday, wday, mon, year;
/* check if rtc is available for access */
while( rtc_read(RTC_CONTROL_A) & RTC_CA_UIP)
;
sec = rtc_read(RTC_SECONDS);
min = rtc_read(RTC_MINUTES);
hour = rtc_read(RTC_HOURS);
mday = rtc_read(RTC_DATE_OF_MONTH);
wday = rtc_read(RTC_DAY_OF_WEEK);
mon = rtc_read(RTC_MONTH);
year = rtc_read(RTC_YEAR);
#ifdef RTC_DEBUG
printf( "Get RTC year: %d; mon: %d; mday: %d; wday: %d; "
"hr: %d; min: %d; sec: %d\n",
year, mon, mday, wday, hour, min, sec );
printf ( "Alarms: hour: %02x min: %02x sec: %02x\n",
rtc_read (RTC_HOURS_ALARM),
rtc_read (RTC_MINUTES_ALARM),
rtc_read (RTC_SECONDS_ALARM) );
#endif
if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
{ /* Information is in BCD format */
printf(" Get: Convert BSD to BIN\n");
tmp->tm_sec = bcd2bin (sec & 0x7F);
tmp->tm_min = bcd2bin (min & 0x7F);
tmp->tm_hour = bcd2bin (hour & 0x3F);
tmp->tm_mday = bcd2bin (mday & 0x3F);
tmp->tm_mon = bcd2bin (mon & 0x1F);
tmp->tm_year = bcd2bin (year);
tmp->tm_wday = bcd2bin (wday & 0x07);
}
else
{
tmp->tm_sec = sec & 0x7F;
tmp->tm_min = min & 0x7F;
tmp->tm_hour = hour & 0x3F;
tmp->tm_mday = mday & 0x3F;
tmp->tm_mon = mon & 0x1F;
tmp->tm_year = year;
tmp->tm_wday = wday & 0x07;
}
if(tmp->tm_year<70)
tmp->tm_year+=2000;
else
tmp->tm_year+=1900;
tmp->tm_yday = 0;
tmp->tm_isdst= 0;
#ifdef RTC_DEBUG
printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
}
void rtc_set (struct rtc_time *tmp)
{
uchar save_ctrl_b;
uchar sec, min, hour, mday, wday, mon, year;
#ifdef RTC_DEBUG
printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
{ /* Information is in BCD format */
year = bin2bcd(tmp->tm_year % 100);
mon = bin2bcd(tmp->tm_mon);
wday = bin2bcd(tmp->tm_wday);
mday = bin2bcd(tmp->tm_mday);
hour = bin2bcd(tmp->tm_hour);
min = bin2bcd(tmp->tm_min);
sec = bin2bcd(tmp->tm_sec);
}
else
{
year = tmp->tm_year % 100;
mon = tmp->tm_mon;
wday = tmp->tm_wday;
mday = tmp->tm_mday;
hour = tmp->tm_hour;
min = tmp->tm_min;
sec = tmp->tm_sec;
}
/* disables the RTC to update the regs */
save_ctrl_b = rtc_read(RTC_CONTROL_B);
save_ctrl_b |= RTC_CB_SET;
rtc_write(RTC_CONTROL_B, save_ctrl_b);
rtc_write (RTC_YEAR, year);
rtc_write (RTC_MONTH, mon);
rtc_write (RTC_DAY_OF_WEEK, wday);
rtc_write (RTC_DATE_OF_MONTH, mday);
rtc_write (RTC_HOURS, hour);
rtc_write (RTC_MINUTES, min);
rtc_write (RTC_SECONDS, sec);
/* enables the RTC to update the regs */
save_ctrl_b &= ~RTC_CB_SET;
rtc_write(RTC_CONTROL_B, save_ctrl_b);
}
void rtc_reset (void)
{
struct rtc_time tmp;
uchar ctrl_rg;
ctrl_rg = RTC_CB_SET;
rtc_write(RTC_CONTROL_B,ctrl_rg);
tmp.tm_year = 1970 % 100;
tmp.tm_mon = 1;
tmp.tm_mday= 1;
tmp.tm_hour = 0;
tmp.tm_min = 0;
tmp.tm_sec = 0;
#ifdef RTC_DEBUG
printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
#endif
ctrl_rg = RTC_CB_SET | RTC_CB_24_12 | RTC_CB_DM;
rtc_write(RTC_CONTROL_B,ctrl_rg);
rtc_set(&tmp);
rtc_write(RTC_HOURS_ALARM, 0),
rtc_write(RTC_MINUTES_ALARM, 0),
rtc_write(RTC_SECONDS_ALARM, 0);
ctrl_rg = RTC_CB_24_12 | RTC_CB_DM;
rtc_write(RTC_CONTROL_B,ctrl_rg);
}
#endif /* (CONFIG_RTC_DS12887) && (CONFIG_COMMANDS & CFG_CMD_DATE) */
|
