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wdenk48b42612003-06-19 23:01:32 +00001/*
2 * (C) Copyright 2003
3 * David Müller ELSOFT AG Switzerland. d.mueller@elsoft.ch
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24/*
25 * Date & Time support for the built-in Samsung S3C24X0 RTC
26 */
27
28#include <common.h>
29#include <command.h>
30
Michal Simek871c18d2008-07-14 19:45:37 +020031#if (defined(CONFIG_CMD_DATE))
wdenk48b42612003-06-19 23:01:32 +000032
33#if defined(CONFIG_S3C2400)
34#include <s3c2400.h>
35#elif defined(CONFIG_S3C2410)
36#include <s3c2410.h>
37#endif
38
39#include <rtc.h>
40
41/*#define DEBUG*/
42
43typedef enum {
44 RTC_ENABLE,
45 RTC_DISABLE
46} RTC_ACCESS;
47
48
49static inline void SetRTC_Access(RTC_ACCESS a)
50{
51 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC();
52 switch (a) {
53 case RTC_ENABLE:
54 rtc->RTCCON |= 0x01; break;
55
56 case RTC_DISABLE:
57 rtc->RTCCON &= ~0x01; break;
58 }
59}
60
61static unsigned bcd2bin (uchar n)
62{
63 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
64}
65
66static unsigned char bin2bcd (unsigned int n)
67{
68 return (((n / 10) << 4) | (n % 10));
69}
70
71/* ------------------------------------------------------------------------- */
72
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030073int rtc_get (struct rtc_time *tmp)
wdenk48b42612003-06-19 23:01:32 +000074{
75 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC();
76 uchar sec, min, hour, mday, wday, mon, year;
77 uchar a_sec,a_min, a_hour, a_date, a_mon, a_year, a_armed;
78
79 /* enable access to RTC registers */
80 SetRTC_Access(RTC_ENABLE);
81
82 /* read RTC registers */
wdenk531716e2003-09-13 19:01:12 +000083 do {
84 sec = rtc->BCDSEC;
85 min = rtc->BCDMIN;
86 hour = rtc->BCDHOUR;
87 mday = rtc->BCDDATE;
88 wday = rtc->BCDDAY;
89 mon = rtc->BCDMON;
90 year = rtc->BCDYEAR;
91 } while (sec != rtc->BCDSEC);
wdenk48b42612003-06-19 23:01:32 +000092
93 /* read ALARM registers */
94 a_sec = rtc->ALMSEC;
95 a_min = rtc->ALMMIN;
96 a_hour = rtc->ALMHOUR;
97 a_date = rtc->ALMDATE;
98 a_mon = rtc->ALMMON;
99 a_year = rtc->ALMYEAR;
100 a_armed = rtc->RTCALM;
101
102 /* disable access to RTC registers */
103 SetRTC_Access(RTC_DISABLE);
104
105#ifdef RTC_DEBUG
106 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
107 "hr: %02x min: %02x sec: %02x\n",
108 year, mon, mday, wday,
109 hour, min, sec);
110 printf ( "Alarms: %02x: year: %02x month: %02x date: %02x hour: %02x min: %02x sec: %02x\n",
111 a_armed,
112 a_year, a_mon, a_date,
113 a_hour, a_min, a_sec);
114#endif
115
116 tmp->tm_sec = bcd2bin(sec & 0x7F);
117 tmp->tm_min = bcd2bin(min & 0x7F);
118 tmp->tm_hour = bcd2bin(hour & 0x3F);
119 tmp->tm_mday = bcd2bin(mday & 0x3F);
120 tmp->tm_mon = bcd2bin(mon & 0x1F);
121 tmp->tm_year = bcd2bin(year);
122 tmp->tm_wday = bcd2bin(wday & 0x07);
123 if(tmp->tm_year<70)
124 tmp->tm_year+=2000;
125 else
126 tmp->tm_year+=1900;
127 tmp->tm_yday = 0;
128 tmp->tm_isdst= 0;
129#ifdef RTC_DEBUG
130 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
131 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
132 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
133#endif
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300134
135 return 0;
wdenk48b42612003-06-19 23:01:32 +0000136}
137
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200138int rtc_set (struct rtc_time *tmp)
wdenk48b42612003-06-19 23:01:32 +0000139{
140 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC();
141 uchar sec, min, hour, mday, wday, mon, year;
142
143#ifdef RTC_DEBUG
144 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
145 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
146 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
147#endif
148 year = bin2bcd(tmp->tm_year % 100);
149 mon = bin2bcd(tmp->tm_mon);
150 wday = bin2bcd(tmp->tm_wday);
151 mday = bin2bcd(tmp->tm_mday);
152 hour = bin2bcd(tmp->tm_hour);
153 min = bin2bcd(tmp->tm_min);
154 sec = bin2bcd(tmp->tm_sec);
155
156 /* enable access to RTC registers */
157 SetRTC_Access(RTC_ENABLE);
158
159 /* write RTC registers */
160 rtc->BCDSEC = sec;
161 rtc->BCDMIN = min;
162 rtc->BCDHOUR = hour;
163 rtc->BCDDATE = mday;
164 rtc->BCDDAY = wday;
165 rtc->BCDMON = mon;
166 rtc->BCDYEAR = year;
167
168 /* disable access to RTC registers */
169 SetRTC_Access(RTC_DISABLE);
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200170
171 return 0;
wdenk48b42612003-06-19 23:01:32 +0000172}
173
174void rtc_reset (void)
175{
176 S3C24X0_RTC * const rtc = S3C24X0_GetBase_RTC();
177
178 rtc->RTCCON = (rtc->RTCCON & ~0x06) | 0x08;
wdenk531716e2003-09-13 19:01:12 +0000179 rtc->RTCCON &= ~(0x08|0x01);
wdenk48b42612003-06-19 23:01:32 +0000180}
181
Jon Loeliger068b60a2007-07-10 10:27:39 -0500182#endif