1 /*
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_CMD_DATE)
41
42 static uchar rtc_read(unsigned int addr );
43 static void rtc_write(unsigned int addr, uchar val);
44
45 #define RTC_EPOCH 2000 /* century */
46
47 /*
48 * DS164x registers layout
49 */
50 #define RTC_BASE ( CONFIG_SYS_NVRAM_BASE_ADDR + CONFIG_SYS_NVRAM_SIZE )
51
52 #define RTC_YEAR ( RTC_BASE + 0x07 )
53 #define RTC_MONTH ( RTC_BASE + 0x06 )
54 #define RTC_DAY_OF_MONTH ( RTC_BASE + 0x05 )
55 #define RTC_DAY_OF_WEEK ( RTC_BASE + 0x04 )
56 #define RTC_HOURS ( RTC_BASE + 0x03 )
57 #define RTC_MINUTES ( RTC_BASE + 0x02 )
58 #define RTC_SECONDS ( RTC_BASE + 0x01 )
59 #define RTC_CONTROL ( RTC_BASE + 0x00 )
60
61 #define RTC_CONTROLA RTC_CONTROL /* W=bit6, R=bit5 */
62 #define RTC_CA_WRITE 0x80
63 #define RTC_CA_READ 0x40
64 #define RTC_CONTROLB RTC_SECONDS /* OSC=bit7 */
65 #define RTC_CB_OSC_DISABLE 0x80
66 #define RTC_CONTROLC RTC_DAY_OF_WEEK /* FT=bit6 */
67 #define RTC_CC_FREQ_TEST 0x40
68
69 /* ------------------------------------------------------------------------- */
70
rtc_get(struct rtc_time * tmp)71 int rtc_get( struct rtc_time *tmp )
72 {
73 uchar sec, min, hour;
74 uchar mday, wday, mon, year;
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
90 /* unlock clock registers after read */
91 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
92
93 #ifdef RTC_DEBUG
94 printf( "Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
95 "hr: %02x min: %02x sec: %02x\n",
96 year, mon, mday, wday,
97 hour, min, sec );
98 #endif
99 tmp->tm_sec = bcd2bin( sec & 0x7F );
100 tmp->tm_min = bcd2bin( min & 0x7F );
101 tmp->tm_hour = bcd2bin( hour & 0x3F );
102 tmp->tm_mday = bcd2bin( mday & 0x3F );
103 tmp->tm_mon = bcd2bin( mon & 0x1F );
104 tmp->tm_wday = bcd2bin( wday & 0x07 );
105
106 /* glue year in century (2000) */
107 tmp->tm_year = bcd2bin( year ) + RTC_EPOCH;
108
109 tmp->tm_yday = 0;
110 tmp->tm_isdst= 0;
111 #ifdef RTC_DEBUG
112 printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
113 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
114 tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
115 #endif
116
117 return 0;
118 }
119
rtc_set(struct rtc_time * tmp)120 int 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 return 0;
148 }
149
rtc_reset(void)150 void rtc_reset (void)
151 {
152 uchar reg_a, reg_b;
153
154 reg_a = rtc_read( RTC_CONTROLA );
155 reg_b = rtc_read( RTC_CONTROLB );
156
157 if ( reg_b & RTC_CB_OSC_DISABLE )
158 {
159 printf( "real-time-clock was stopped. Now starting...\n" );
160 reg_a |= RTC_CA_WRITE;
161 reg_b &= ~RTC_CB_OSC_DISABLE;
162
163 rtc_write( RTC_CONTROLA, reg_a );
164 rtc_write( RTC_CONTROLB, reg_b );
165 }
166
167 /* make sure read/write clock register bits are cleared */
168 reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
169 rtc_write( RTC_CONTROLA, reg_a );
170 }
171
172 /* ------------------------------------------------------------------------- */
173
rtc_read(unsigned int addr)174 static uchar rtc_read( unsigned int addr )
175 {
176 uchar val = *(volatile unsigned char*)(addr);
177
178 #ifdef RTC_DEBUG
179 printf( "rtc_read: %x:%x\n", addr, val );
180 #endif
181 return( val );
182 }
183
rtc_write(unsigned int addr,uchar val)184 static void rtc_write( unsigned int addr, uchar val )
185 {
186 #ifdef RTC_DEBUG
187 printf( "rtc_write: %x:%x\n", addr, val );
188 #endif
189 *(volatile unsigned char*)(addr) = val;
190 }
191
192 #endif
193