]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/rtc/ds164x.c
3 * ARIO Data Networks, Inc. dchiu@ariodata.com
6 * The LEOX team <team@leox.org>, http://www.leox.org
8 * Based on MontaVista DS1743 code and U-Boot mc146818 code
10 * SPDX-License-Identifier: GPL-2.0+
14 * Date & Time support for the DS164x RTC
17 /* #define RTC_DEBUG */
24 #if defined(CONFIG_CMD_DATE)
26 static uchar
rtc_read(unsigned int addr
);
27 static void rtc_write(unsigned int addr
, uchar val
);
29 #define RTC_EPOCH 2000 /* century */
32 * DS164x registers layout
34 #define RTC_BASE ( CONFIG_SYS_NVRAM_BASE_ADDR + CONFIG_SYS_NVRAM_SIZE )
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 )
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
53 /* ------------------------------------------------------------------------- */
55 int rtc_get( struct rtc_time
*tmp
)
58 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
);
74 /* unlock clock registers after read */
75 rtc_write( RTC_CONTROLA
, ( reg_a
& ~RTC_CA_READ
));
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
,
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 );
90 /* glue year in century (2000) */
91 tmp
->tm_year
= bcd2bin( year
) + RTC_EPOCH
;
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
);
104 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 in century */
126 rtc_write( RTC_YEAR
, bin2bcd( tmp
->tm_year
% 100 ));
128 /* unlock clock registers after read */
129 rtc_write( RTC_CONTROLA
, ( reg_a
& ~RTC_CA_WRITE
));
134 void rtc_reset (void)
138 reg_a
= rtc_read( RTC_CONTROLA
);
139 reg_b
= rtc_read( RTC_CONTROLB
);
141 if ( reg_b
& RTC_CB_OSC_DISABLE
)
143 printf( "real-time-clock was stopped. Now starting...\n" );
144 reg_a
|= RTC_CA_WRITE
;
145 reg_b
&= ~RTC_CB_OSC_DISABLE
;
147 rtc_write( RTC_CONTROLA
, reg_a
);
148 rtc_write( RTC_CONTROLB
, reg_b
);
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
);
156 /* ------------------------------------------------------------------------- */
158 static uchar
rtc_read( unsigned int addr
)
160 uchar val
= *(volatile unsigned char*)(addr
);
163 printf( "rtc_read: %x:%x\n", addr
, val
);
168 static void rtc_write( unsigned int addr
, uchar val
)
171 printf( "rtc_write: %x:%x\n", addr
, val
);
173 *(volatile unsigned char*)(addr
) = val
;