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c609719b WD |
1 | /* |
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 | * | |
1a459660 | 10 | * SPDX-License-Identifier: GPL-2.0+ |
c609719b WD |
11 | */ |
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 | ||
871c18dd | 23 | #if defined(CONFIG_CMD_DATE) |
c609719b WD |
24 | |
25 | static uchar rtc_read( unsigned int addr ); | |
26 | static void rtc_write( unsigned int addr, uchar val); | |
c609719b | 27 | |
6d0f6bcf | 28 | #define RTC_BASE ( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR ) |
c609719b WD |
29 | |
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 | ||
b73a19e1 | 53 | int rtc_get( struct rtc_time *tmp ) |
c609719b WD |
54 | { |
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 | |
b73a19e1 | 102 | return 0; |
c609719b WD |
103 | } |
104 | ||
d1e23194 | 105 | int rtc_set( struct rtc_time *tmp ) |
c609719b WD |
106 | { |
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 )); | |
d1e23194 JCPV |
131 | |
132 | return 0; | |
c609719b WD |
133 | } |
134 | ||
135 | void 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 | ||
163 | static 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 | ||
172 | static 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 | ||
068b60a0 | 180 | #endif |