1 /*
2 * (C) Copyright 2002
3 * ARIO Data Networks, Inc. dchiu@ariodata.com
4 *
5 * modified for DS1556:
6 * Frank Panno <fpanno@delphintech.com>, Delphin Technology AG
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 DS1556 RTC
31 */
32
33 /*#define RTC_DEBUG */
34
35 #include <common.h>
36 #include <command.h>
37 #include <rtc.h>
38
39 #if defined(CONFIG_CMD_DATE)
40
41 static uchar rtc_read( unsigned int addr );
42 static void rtc_write( unsigned int addr, uchar val);
43
44 #define RTC_BASE ( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR )
45
46 #define RTC_YEAR ( RTC_BASE + 0xf )
47 #define RTC_MONTH ( RTC_BASE + 0xe )
48 #define RTC_DAY_OF_MONTH ( RTC_BASE + 0xd )
49 #define RTC_DAY_OF_WEEK ( RTC_BASE + 0xc )
50 #define RTC_HOURS ( RTC_BASE + 0xb )
51 #define RTC_MINUTES ( RTC_BASE + 0xa )
52 #define RTC_SECONDS ( RTC_BASE + 0x9 )
53 #define RTC_CENTURY ( RTC_BASE + 0x8 )
54
55 #define RTC_CONTROLA RTC_CENTURY
56 #define RTC_CONTROLB RTC_SECONDS
57 #define RTC_CONTROLC RTC_BASE
58
59 #define RTC_CA_WRITE 0x80
60 #define RTC_CA_READ 0x40
61
62 #define RTC_CB_OSC_DISABLE 0x80
63
64 #define RTC_CC_BATTERY_FLAG 0x10
65 #define RTC_CC_FREQ_TEST 0x40
66
67 /* ------------------------------------------------------------------------- */
68
rtc_get(struct rtc_time * tmp)69 int rtc_get( struct rtc_time *tmp )
70 {
71 uchar sec, min, hour;
72 uchar mday, wday, mon, year;
73
74 int century;
75
76 uchar reg_a;
77
78 reg_a = rtc_read( RTC_CONTROLA );
79 /* lock clock registers for read */
80 rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));
81
82 sec = rtc_read( RTC_SECONDS );
83 min = rtc_read( RTC_MINUTES );
84 hour = rtc_read( RTC_HOURS );
85 mday = rtc_read( RTC_DAY_OF_MONTH );
86 wday = rtc_read( RTC_DAY_OF_WEEK );
87 mon = rtc_read( RTC_MONTH );
88 year = rtc_read( RTC_YEAR );
89 century = rtc_read( RTC_CENTURY );
90
91 /* unlock clock registers after read */
92 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
93
94 #ifdef RTC_DEBUG
95 printf( "Get RTC year: %02x mon/cent: %02x mon: %02x mday: %02x wday: %02x "
96 "hr: %02x min: %02x sec: %02x\n",
97 year, century, mon, mday, wday,
98 hour, min, sec );
99 #endif
100 tmp->tm_sec = bcd2bin( sec & 0x7F );
101 tmp->tm_min = bcd2bin( min & 0x7F );
102 tmp->tm_hour = bcd2bin( hour & 0x3F );
103 tmp->tm_mday = bcd2bin( mday & 0x3F );
104 tmp->tm_mon = bcd2bin( mon & 0x1F );
105 tmp->tm_wday = bcd2bin( wday & 0x07 );
106
107 /* glue year from century and year in century */
108 tmp->tm_year = bcd2bin( year ) +
109 ( bcd2bin( century & 0x3F ) * 100 );
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 return 0;
119 }
120
rtc_set(struct rtc_time * tmp)121 int rtc_set( struct rtc_time *tmp )
122 {
123 uchar reg_a;
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 up into century and year in century */
142 rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
143 rtc_write( RTC_CENTURY, bin2bcd( tmp->tm_year / 100 ));
144
145 /* unlock clock registers after read */
146 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
147
148 return 0;
149 }
150
rtc_reset(void)151 void rtc_reset (void)
152 {
153 uchar reg_a, reg_b, reg_c;
154
155 reg_a = rtc_read( RTC_CONTROLA );
156 reg_b = rtc_read( RTC_CONTROLB );
157
158 if ( reg_b & RTC_CB_OSC_DISABLE )
159 {
160 printf( "real-time-clock was stopped. Now starting...\n" );
161 reg_a |= RTC_CA_WRITE;
162 reg_b &= ~RTC_CB_OSC_DISABLE;
163
164 rtc_write( RTC_CONTROLA, reg_a );
165 rtc_write( RTC_CONTROLB, reg_b );
166 }
167
168 /* make sure read/write clock register bits are cleared */
169 reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
170 rtc_write( RTC_CONTROLA, reg_a );
171
172 reg_c = rtc_read( RTC_CONTROLC );
173 if (( reg_c & RTC_CC_BATTERY_FLAG ) == 0 )
174 printf( "RTC battery low. Clock setting may not be reliable.\n" );
175 }
176
177 /* ------------------------------------------------------------------------- */
178
rtc_read(unsigned int addr)179 static uchar rtc_read( unsigned int addr )
180 {
181 uchar val = *(volatile unsigned char*)(addr);
182 #ifdef RTC_DEBUG
183 printf( "rtc_read: %x:%x\n", addr, val );
184 #endif
185 return( val );
186 }
187
rtc_write(unsigned int addr,uchar val)188 static void rtc_write( unsigned int addr, uchar val )
189 {
190 #ifdef RTC_DEBUG
191 printf( "rtc_write: %x:%x\n", addr, val );
192 #endif
193 *(volatile unsigned char*)(addr) = val;
194 }
195
196 #endif
197