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wdenk3bac3512003-03-12 10:41:04 +00001/*
2 * (C) Copyright 2002
3 * ARIO Data Networks, Inc. dchiu@ariodata.com
wdenk8bde7f72003-06-27 21:31:46 +00004 *
wdenk3bac3512003-03-12 10:41:04 +00005 * 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 *
Wolfgang Denk1a459662013-07-08 09:37:19 +020010 * SPDX-License-Identifier: GPL-2.0+
wdenk3bac3512003-03-12 10:41:04 +000011 */
12
13/*
14 * Date & Time support for the DS164x RTC
15 */
16
17/* #define RTC_DEBUG */
18
19#include <common.h>
20#include <command.h>
21#include <rtc.h>
22
23
Michal Simek871c18d2008-07-14 19:45:37 +020024#if defined(CONFIG_CMD_DATE)
wdenk3bac3512003-03-12 10:41:04 +000025
26static uchar rtc_read(unsigned int addr );
27static void rtc_write(unsigned int addr, uchar val);
wdenk3bac3512003-03-12 10:41:04 +000028
29#define RTC_EPOCH 2000 /* century */
30
31/*
32 * DS164x registers layout
33 */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020034#define RTC_BASE ( CONFIG_SYS_NVRAM_BASE_ADDR + CONFIG_SYS_NVRAM_SIZE )
wdenk3bac3512003-03-12 10:41:04 +000035
36#define RTC_YEAR ( RTC_BASE + 0x07 )
37#define RTC_MONTH ( RTC_BASE + 0x06 )
38#define RTC_DAY_OF_MONTH ( RTC_BASE + 0x05 )
39#define RTC_DAY_OF_WEEK ( RTC_BASE + 0x04 )
40#define RTC_HOURS ( RTC_BASE + 0x03 )
41#define RTC_MINUTES ( RTC_BASE + 0x02 )
42#define RTC_SECONDS ( RTC_BASE + 0x01 )
43#define RTC_CONTROL ( RTC_BASE + 0x00 )
44
45#define RTC_CONTROLA RTC_CONTROL /* W=bit6, R=bit5 */
46#define RTC_CA_WRITE 0x80
47#define RTC_CA_READ 0x40
48#define RTC_CONTROLB RTC_SECONDS /* OSC=bit7 */
49#define RTC_CB_OSC_DISABLE 0x80
50#define RTC_CONTROLC RTC_DAY_OF_WEEK /* FT=bit6 */
51#define RTC_CC_FREQ_TEST 0x40
52
53/* ------------------------------------------------------------------------- */
54
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030055int rtc_get( struct rtc_time *tmp )
wdenk3bac3512003-03-12 10:41:04 +000056{
57 uchar sec, min, hour;
58 uchar mday, wday, mon, year;
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
74 /* unlock clock registers after read */
75 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
76
77#ifdef RTC_DEBUG
78 printf( "Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
79 "hr: %02x min: %02x sec: %02x\n",
80 year, mon, mday, wday,
81 hour, min, sec );
82#endif
83 tmp->tm_sec = bcd2bin( sec & 0x7F );
84 tmp->tm_min = bcd2bin( min & 0x7F );
85 tmp->tm_hour = bcd2bin( hour & 0x3F );
86 tmp->tm_mday = bcd2bin( mday & 0x3F );
87 tmp->tm_mon = bcd2bin( mon & 0x1F );
88 tmp->tm_wday = bcd2bin( wday & 0x07 );
89
90 /* glue year in century (2000) */
91 tmp->tm_year = bcd2bin( year ) + RTC_EPOCH;
92
93 tmp->tm_yday = 0;
94 tmp->tm_isdst= 0;
95#ifdef RTC_DEBUG
96 printf( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
97 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
98 tmp->tm_hour, tmp->tm_min, tmp->tm_sec );
99#endif
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300100
101 return 0;
wdenk3bac3512003-03-12 10:41:04 +0000102}
103
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200104int rtc_set( struct rtc_time *tmp )
wdenk3bac3512003-03-12 10:41:04 +0000105{
106 uchar reg_a;
107
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 in century */
126 rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
127
128 /* unlock clock registers after read */
129 rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200130
131 return 0;
wdenk3bac3512003-03-12 10:41:04 +0000132}
133
134void rtc_reset (void)
135{
136 uchar reg_a, reg_b;
137
138 reg_a = rtc_read( RTC_CONTROLA );
139 reg_b = rtc_read( RTC_CONTROLB );
140
141 if ( reg_b & RTC_CB_OSC_DISABLE )
142 {
143 printf( "real-time-clock was stopped. Now starting...\n" );
144 reg_a |= RTC_CA_WRITE;
145 reg_b &= ~RTC_CB_OSC_DISABLE;
146
147 rtc_write( RTC_CONTROLA, reg_a );
148 rtc_write( RTC_CONTROLB, reg_b );
149 }
150
151 /* make sure read/write clock register bits are cleared */
152 reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
153 rtc_write( RTC_CONTROLA, reg_a );
154}
155
156/* ------------------------------------------------------------------------- */
157
158static uchar rtc_read( unsigned int addr )
159{
160 uchar val = *(volatile unsigned char*)(addr);
161
162#ifdef RTC_DEBUG
163 printf( "rtc_read: %x:%x\n", addr, val );
164#endif
165 return( val );
166}
167
168static void rtc_write( unsigned int addr, uchar val )
169{
170#ifdef RTC_DEBUG
171 printf( "rtc_write: %x:%x\n", addr, val );
172#endif
173 *(volatile unsigned char*)(addr) = val;
174}
175
Jon Loeliger068b60a2007-07-10 10:27:39 -0500176#endif