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wdenk15ef8a52003-06-18 20:22:24 +00001/*
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_RTC_DS12887) && (CONFIG_COMMANDS & CFG_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
55static 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
66static 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
79static unsigned bcd2bin (uchar n)
80{
81 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
82}
83
84static unsigned char bin2bcd (unsigned int n)
85{
86 return (((n / 10) << 4) | (n % 10));
87}
88
89/* ------------------------------------------------------------------------- */
90
91void rtc_get (struct rtc_time *tmp)
92{
93 uchar sec, min, hour, mday, wday, mon, year;
94
95 /* check if rtc is available for access */
96 while( rtc_read(RTC_CONTROL_A) & RTC_CA_UIP)
97 ;
98
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);
106
107#ifdef RTC_DEBUG
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 );
111
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) );
116#endif
117
118 if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
119 { /* Information is in BCD format */
120printf(" 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);
128 }
129else
130 {
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;
136 tmp->tm_year = year;
137 tmp->tm_wday = wday & 0x07;
138 }
139
140
141 if(tmp->tm_year<70)
142 tmp->tm_year+=2000;
143 else
144 tmp->tm_year+=1900;
145
146 tmp->tm_yday = 0;
147 tmp->tm_isdst= 0;
148#ifdef RTC_DEBUG
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);
152#endif
153}
154
155void rtc_set (struct rtc_time *tmp)
156{
157 uchar save_ctrl_b;
158 uchar sec, min, hour, mday, wday, mon, year;
159
160#ifdef RTC_DEBUG
161 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
162 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
163 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
164#endif
165
166 if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM))
167 { /* Information is in BCD format */
168 year = bin2bcd(tmp->tm_year % 100);
169 mon = bin2bcd(tmp->tm_mon);
170 wday = bin2bcd(tmp->tm_wday);
171 mday = bin2bcd(tmp->tm_mday);
172 hour = bin2bcd(tmp->tm_hour);
173 min = bin2bcd(tmp->tm_min);
174 sec = bin2bcd(tmp->tm_sec);
175 }
176 else
177 {
178 year = tmp->tm_year % 100;
179 mon = tmp->tm_mon;
180 wday = tmp->tm_wday;
181 mday = tmp->tm_mday;
182 hour = tmp->tm_hour;
183 min = tmp->tm_min;
184 sec = tmp->tm_sec;
185 }
186
187 /* disables the RTC to update the regs */
188 save_ctrl_b = rtc_read(RTC_CONTROL_B);
189 save_ctrl_b |= RTC_CB_SET;
190 rtc_write(RTC_CONTROL_B, save_ctrl_b);
191
192 rtc_write (RTC_YEAR, year);
193 rtc_write (RTC_MONTH, mon);
194 rtc_write (RTC_DAY_OF_WEEK, wday);
195 rtc_write (RTC_DATE_OF_MONTH, mday);
196 rtc_write (RTC_HOURS, hour);
197 rtc_write (RTC_MINUTES, min);
198 rtc_write (RTC_SECONDS, sec);
199
200 /* enables the RTC to update the regs */
201 save_ctrl_b &= ~RTC_CB_SET;
202 rtc_write(RTC_CONTROL_B, save_ctrl_b);
203}
204
205void rtc_reset (void)
206{
207 struct rtc_time tmp;
208 uchar ctrl_rg;
209
210 ctrl_rg = RTC_CB_SET;
211 rtc_write(RTC_CONTROL_B,ctrl_rg);
212
213 tmp.tm_year = 1970 % 100;
214 tmp.tm_mon = 1;
215 tmp.tm_mday= 1;
216 tmp.tm_hour = 0;
217 tmp.tm_min = 0;
218 tmp.tm_sec = 0;
219
220#ifdef RTC_DEBUG
221 printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
222 tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
223 tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
224#endif
225
226 ctrl_rg = RTC_CB_SET | RTC_CB_24_12 | RTC_CB_DM;
227 rtc_write(RTC_CONTROL_B,ctrl_rg);
228 rtc_set(&tmp);
229
230 rtc_write(RTC_HOURS_ALARM, 0),
231 rtc_write(RTC_MINUTES_ALARM, 0),
232 rtc_write(RTC_SECONDS_ALARM, 0);
233
234 ctrl_rg = RTC_CB_24_12 | RTC_CB_DM;
235 rtc_write(RTC_CONTROL_B,ctrl_rg);
236}
237
238#endif /* (CONFIG_RTC_DS12887) && (CONFIG_COMMANDS & CFG_CMD_DATE) */