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wdenkc6097192002-11-03 00:24:07 +00001/*
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 *
Wolfgang Denk1a459662013-07-08 09:37:19 +020010 * SPDX-License-Identifier: GPL-2.0+
wdenkc6097192002-11-03 00:24:07 +000011 */
12
13/*
14 * Date & Time support for the DS1556 RTC
15 */
16
17/*#define RTC_DEBUG */
18
19#include <common.h>
20#include <command.h>
21#include <rtc.h>
22
Michal Simek871c18d2008-07-14 19:45:37 +020023#if defined(CONFIG_CMD_DATE)
wdenkc6097192002-11-03 00:24:07 +000024
25static uchar rtc_read( unsigned int addr );
26static void rtc_write( unsigned int addr, uchar val);
wdenkc6097192002-11-03 00:24:07 +000027
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020028#define RTC_BASE ( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR )
wdenkc6097192002-11-03 00:24:07 +000029
30#define RTC_YEAR ( RTC_BASE + 0xf )
31#define RTC_MONTH ( RTC_BASE + 0xe )
32#define RTC_DAY_OF_MONTH ( RTC_BASE + 0xd )
33#define RTC_DAY_OF_WEEK ( RTC_BASE + 0xc )
34#define RTC_HOURS ( RTC_BASE + 0xb )
35#define RTC_MINUTES ( RTC_BASE + 0xa )
36#define RTC_SECONDS ( RTC_BASE + 0x9 )
37#define RTC_CENTURY ( RTC_BASE + 0x8 )
38
39#define RTC_CONTROLA RTC_CENTURY
40#define RTC_CONTROLB RTC_SECONDS
41#define RTC_CONTROLC RTC_BASE
42
43#define RTC_CA_WRITE 0x80
44#define RTC_CA_READ 0x40
45
46#define RTC_CB_OSC_DISABLE 0x80
47
48#define RTC_CC_BATTERY_FLAG 0x10
49#define RTC_CC_FREQ_TEST 0x40
50
51/* ------------------------------------------------------------------------- */
52
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030053int rtc_get( struct rtc_time *tmp )
wdenkc6097192002-11-03 00:24:07 +000054{
55 uchar sec, min, hour;
56 uchar mday, wday, mon, year;
57
58 int century;
59
60 uchar reg_a;
61
62 reg_a = rtc_read( RTC_CONTROLA );
63 /* lock clock registers for read */
64 rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));
65
66 sec = rtc_read( RTC_SECONDS );
67 min = rtc_read( RTC_MINUTES );
68 hour = rtc_read( RTC_HOURS );
69 mday = rtc_read( RTC_DAY_OF_MONTH );
70 wday = rtc_read( RTC_DAY_OF_WEEK );
71 mon = rtc_read( RTC_MONTH );
72 year = rtc_read( RTC_YEAR );
73 century = rtc_read( RTC_CENTURY );
74
75 /* unlock clock registers after read */
76 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
77
78#ifdef RTC_DEBUG
79 printf( "Get RTC year: %02x mon/cent: %02x mon: %02x mday: %02x wday: %02x "
80 "hr: %02x min: %02x sec: %02x\n",
81 year, century, mon, mday, wday,
82 hour, min, sec );
83#endif
84 tmp->tm_sec = bcd2bin( sec & 0x7F );
85 tmp->tm_min = bcd2bin( min & 0x7F );
86 tmp->tm_hour = bcd2bin( hour & 0x3F );
87 tmp->tm_mday = bcd2bin( mday & 0x3F );
88 tmp->tm_mon = bcd2bin( mon & 0x1F );
89 tmp->tm_wday = bcd2bin( wday & 0x07 );
90
91 /* glue year from century and year in century */
92 tmp->tm_year = bcd2bin( year ) +
93 ( bcd2bin( century & 0x3F ) * 100 );
94
95 tmp->tm_yday = 0;
96 tmp->tm_isdst= 0;
97#ifdef RTC_DEBUG
98 printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
99 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
100 tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
101#endif
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300102 return 0;
wdenkc6097192002-11-03 00:24:07 +0000103}
104
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200105int rtc_set( struct rtc_time *tmp )
wdenkc6097192002-11-03 00:24:07 +0000106{
107 uchar reg_a;
108#ifdef RTC_DEBUG
109 printf( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
110 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
111 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
112#endif
113 /* lock clock registers for write */
114 reg_a = rtc_read( RTC_CONTROLA );
115 rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE ));
116
117 rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
118
119 rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
120 rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
121 rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
122 rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
123 rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
124
125 /* break year up into century and year in century */
126 rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
127 rtc_write( RTC_CENTURY, bin2bcd( tmp->tm_year / 100 ));
128
129 /* unlock clock registers after read */
130 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200131
132 return 0;
wdenkc6097192002-11-03 00:24:07 +0000133}
134
135void rtc_reset (void)
136{
137 uchar reg_a, reg_b, reg_c;
138
139 reg_a = rtc_read( RTC_CONTROLA );
140 reg_b = rtc_read( RTC_CONTROLB );
141
142 if ( reg_b & RTC_CB_OSC_DISABLE )
143 {
144 printf( "real-time-clock was stopped. Now starting...\n" );
145 reg_a |= RTC_CA_WRITE;
146 reg_b &= ~RTC_CB_OSC_DISABLE;
147
148 rtc_write( RTC_CONTROLA, reg_a );
149 rtc_write( RTC_CONTROLB, reg_b );
150 }
151
152 /* make sure read/write clock register bits are cleared */
153 reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
154 rtc_write( RTC_CONTROLA, reg_a );
155
156 reg_c = rtc_read( RTC_CONTROLC );
157 if (( reg_c & RTC_CC_BATTERY_FLAG ) == 0 )
158 printf( "RTC battery low. Clock setting may not be reliable.\n" );
159}
160
161/* ------------------------------------------------------------------------- */
162
163static uchar rtc_read( unsigned int addr )
164{
165 uchar val = *(volatile unsigned char*)(addr);
166#ifdef RTC_DEBUG
167 printf( "rtc_read: %x:%x\n", addr, val );
168#endif
169 return( val );
170}
171
172static void rtc_write( unsigned int addr, uchar val )
173{
174#ifdef RTC_DEBUG
175 printf( "rtc_write: %x:%x\n", addr, val );
176#endif
177 *(volatile unsigned char*)(addr) = val;
178}
179
Jon Loeliger068b60a2007-07-10 10:27:39 -0500180#endif