3
* ARIO Data Networks, Inc. dchiu@ariodata.com
6
* Frank Panno <fpanno@delphintech.com>, Delphin Technology AG
8
* Based on MontaVista DS1743 code and U-Boot mc146818 code
10
* SPDX-License-Identifier: GPL-2.0+
14
* Date & Time support for the DS1556 RTC
17
/*#define RTC_DEBUG */
23
#if defined(CONFIG_CMD_DATE)
25
static uchar rtc_read( unsigned int addr );
26
static void rtc_write( unsigned int addr, uchar val);
28
#define RTC_BASE ( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR )
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 )
39
#define RTC_CONTROLA RTC_CENTURY
40
#define RTC_CONTROLB RTC_SECONDS
41
#define RTC_CONTROLC RTC_BASE
43
#define RTC_CA_WRITE 0x80
44
#define RTC_CA_READ 0x40
46
#define RTC_CB_OSC_DISABLE 0x80
48
#define RTC_CC_BATTERY_FLAG 0x10
49
#define RTC_CC_FREQ_TEST 0x40
51
/* ------------------------------------------------------------------------- */
53
int rtc_get( struct rtc_time *tmp )
56
uchar mday, wday, mon, year;
62
reg_a = rtc_read( RTC_CONTROLA );
63
/* lock clock registers for read */
64
rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));
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 );
75
/* unlock clock registers after read */
76
rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
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,
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 );
91
/* glue year from century and year in century */
92
tmp->tm_year = bcd2bin( year ) +
93
( bcd2bin( century & 0x3F ) * 100 );
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 );
105
int rtc_set( struct rtc_time *tmp )
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);
113
/* lock clock registers for write */
114
reg_a = rtc_read( RTC_CONTROLA );
115
rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE ));
117
rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
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 ));
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 ));
129
/* unlock clock registers after read */
130
rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
135
void rtc_reset (void)
137
uchar reg_a, reg_b, reg_c;
139
reg_a = rtc_read( RTC_CONTROLA );
140
reg_b = rtc_read( RTC_CONTROLB );
142
if ( reg_b & RTC_CB_OSC_DISABLE )
144
printf( "real-time-clock was stopped. Now starting...\n" );
145
reg_a |= RTC_CA_WRITE;
146
reg_b &= ~RTC_CB_OSC_DISABLE;
148
rtc_write( RTC_CONTROLA, reg_a );
149
rtc_write( RTC_CONTROLB, reg_b );
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 );
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" );
161
/* ------------------------------------------------------------------------- */
163
static uchar rtc_read( unsigned int addr )
165
uchar val = *(volatile unsigned char*)(addr);
167
printf( "rtc_read: %x:%x\n", addr, val );
172
static void rtc_write( unsigned int addr, uchar val )
175
printf( "rtc_write: %x:%x\n", addr, val );
177
*(volatile unsigned char*)(addr) = val;