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wdenk3bac3512003-03-12 10:41:04 +00001/*
2 * (C) Copyright 2002
3 * ARIO Data Networks, Inc. dchiu@ariodata.com
4 *
5 * modified for DS164x:
6 * The LEOX team <team@leox.org>, http://www.leox.org
7 *
8 * Based on MontaVista DS1743 code and U-Boot mc146818 code
9 *
10 * See file CREDITS for list of people who contributed to this
11 * project.
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of
16 * the License, or (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 * MA 02111-1307 USA
27 */
28
29/*
30 * Date & Time support for the DS164x RTC
31 */
32
33/* #define RTC_DEBUG */
34
35#include <common.h>
36#include <command.h>
37#include <rtc.h>
38
39
40#if defined(CONFIG_RTC_DS164x) && (CONFIG_COMMANDS & CFG_CMD_DATE)
41
42static uchar rtc_read(unsigned int addr );
43static void rtc_write(unsigned int addr, uchar val);
44static uchar bin2bcd(unsigned int n);
45static unsigned bcd2bin(uchar c);
46
47#define RTC_EPOCH 2000 /* century */
48
49/*
50 * DS164x registers layout
51 */
52#define RTC_BASE ( CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE )
53
54#define RTC_YEAR ( RTC_BASE + 0x07 )
55#define RTC_MONTH ( RTC_BASE + 0x06 )
56#define RTC_DAY_OF_MONTH ( RTC_BASE + 0x05 )
57#define RTC_DAY_OF_WEEK ( RTC_BASE + 0x04 )
58#define RTC_HOURS ( RTC_BASE + 0x03 )
59#define RTC_MINUTES ( RTC_BASE + 0x02 )
60#define RTC_SECONDS ( RTC_BASE + 0x01 )
61#define RTC_CONTROL ( RTC_BASE + 0x00 )
62
63#define RTC_CONTROLA RTC_CONTROL /* W=bit6, R=bit5 */
64#define RTC_CA_WRITE 0x80
65#define RTC_CA_READ 0x40
66#define RTC_CONTROLB RTC_SECONDS /* OSC=bit7 */
67#define RTC_CB_OSC_DISABLE 0x80
68#define RTC_CONTROLC RTC_DAY_OF_WEEK /* FT=bit6 */
69#define RTC_CC_FREQ_TEST 0x40
70
71/* ------------------------------------------------------------------------- */
72
73void rtc_get( struct rtc_time *tmp )
74{
75 uchar sec, min, hour;
76 uchar mday, wday, mon, year;
77
78 uchar reg_a;
79
80 reg_a = rtc_read( RTC_CONTROLA );
81 /* lock clock registers for read */
82 rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));
83
84 sec = rtc_read( RTC_SECONDS );
85 min = rtc_read( RTC_MINUTES );
86 hour = rtc_read( RTC_HOURS );
87 mday = rtc_read( RTC_DAY_OF_MONTH );
88 wday = rtc_read( RTC_DAY_OF_WEEK );
89 mon = rtc_read( RTC_MONTH );
90 year = rtc_read( RTC_YEAR );
91
92 /* unlock clock registers after read */
93 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
94
95#ifdef RTC_DEBUG
96 printf( "Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
97 "hr: %02x min: %02x sec: %02x\n",
98 year, mon, mday, wday,
99 hour, min, sec );
100#endif
101 tmp->tm_sec = bcd2bin( sec & 0x7F );
102 tmp->tm_min = bcd2bin( min & 0x7F );
103 tmp->tm_hour = bcd2bin( hour & 0x3F );
104 tmp->tm_mday = bcd2bin( mday & 0x3F );
105 tmp->tm_mon = bcd2bin( mon & 0x1F );
106 tmp->tm_wday = bcd2bin( wday & 0x07 );
107
108 /* glue year in century (2000) */
109 tmp->tm_year = bcd2bin( year ) + RTC_EPOCH;
110
111 tmp->tm_yday = 0;
112 tmp->tm_isdst= 0;
113#ifdef RTC_DEBUG
114 printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
115 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
116 tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
117#endif
118}
119
120void rtc_set( struct rtc_time *tmp )
121{
122 uchar reg_a;
123
124#ifdef RTC_DEBUG
125 printf( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
126 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
127 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
128#endif
129 /* lock clock registers for write */
130 reg_a = rtc_read( RTC_CONTROLA );
131 rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE ));
132
133 rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
134
135 rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
136 rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
137 rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
138 rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
139 rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
140
141 /* break year in century */
142 rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
143
144 /* unlock clock registers after read */
145 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
146}
147
148void rtc_reset (void)
149{
150 uchar reg_a, reg_b;
151
152 reg_a = rtc_read( RTC_CONTROLA );
153 reg_b = rtc_read( RTC_CONTROLB );
154
155 if ( reg_b & RTC_CB_OSC_DISABLE )
156 {
157 printf( "real-time-clock was stopped. Now starting...\n" );
158 reg_a |= RTC_CA_WRITE;
159 reg_b &= ~RTC_CB_OSC_DISABLE;
160
161 rtc_write( RTC_CONTROLA, reg_a );
162 rtc_write( RTC_CONTROLB, reg_b );
163 }
164
165 /* make sure read/write clock register bits are cleared */
166 reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
167 rtc_write( RTC_CONTROLA, reg_a );
168}
169
170/* ------------------------------------------------------------------------- */
171
172static uchar rtc_read( unsigned int addr )
173{
174 uchar val = *(volatile unsigned char*)(addr);
175
176#ifdef RTC_DEBUG
177 printf( "rtc_read: %x:%x\n", addr, val );
178#endif
179 return( val );
180}
181
182static void rtc_write( unsigned int addr, uchar val )
183{
184#ifdef RTC_DEBUG
185 printf( "rtc_write: %x:%x\n", addr, val );
186#endif
187 *(volatile unsigned char*)(addr) = val;
188}
189
190static unsigned bcd2bin (uchar n)
191{
192 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
193}
194
195static unsigned char bin2bcd (unsigned int n)
196{
197 return (((n / 10) << 4) | (n % 10));
198}
199
200#endif /* CONFIG_RTC_DS164x && CFG_CMD_DATE */