1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/*
* (C) Copyright 2001
* Denis Peter MPL AG Switzerland. d.peter@mpl.ch
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Date & Time support for the MC146818 (PIXX4) RTC
*/
/*#define DEBUG*/
#include <common.h>
#include <command.h>
#include <rtc.h>
#include <version.h>
#if defined(__I386__) || defined(CONFIG_MALTA)
#include <asm/io.h>
#define in8(p) inb(p)
#define out8(p, v) outb(v, p)
#endif
#if defined(CONFIG_CMD_DATE)
/* Set this to 1 to clear the CMOS RAM */
#define CLEAR_CMOS 0
static uchar rtc_read (uchar reg);
static void rtc_write (uchar reg, uchar val);
#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
#define RTC_SECONDS 0x00
#define RTC_SECONDS_ALARM 0x01
#define RTC_MINUTES 0x02
#define RTC_MINUTES_ALARM 0x03
#define RTC_HOURS 0x04
#define RTC_HOURS_ALARM 0x05
#define RTC_DAY_OF_WEEK 0x06
#define RTC_DATE_OF_MONTH 0x07
#define RTC_MONTH 0x08
#define RTC_YEAR 0x09
#define RTC_CONFIG_A 0x0A
#define RTC_CONFIG_B 0x0B
#define RTC_CONFIG_C 0x0C
#define RTC_CONFIG_D 0x0D
#define RTC_REG_SIZE 0x80
#define RTC_CONFIG_A_REF_CLCK_32KHZ (1 << 5)
#define RTC_CONFIG_A_RATE_1024HZ 6
#define RTC_CONFIG_B_24H (1 << 1)
#define RTC_CONFIG_D_VALID_RAM_AND_TIME 0x80
/* ------------------------------------------------------------------------- */
int rtc_get (struct rtc_time *tmp)
{
uchar sec, min, hour, mday, wday, mon, year;
/* here check if rtc can be accessed */
while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
sec = rtc_read (RTC_SECONDS);
min = rtc_read (RTC_MINUTES);
hour = rtc_read (RTC_HOURS);
mday = rtc_read (RTC_DATE_OF_MONTH);
wday = rtc_read (RTC_DAY_OF_WEEK);
mon = rtc_read (RTC_MONTH);
year = rtc_read (RTC_YEAR);
#ifdef RTC_DEBUG
printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
"hr: %02x min: %02x sec: %02x\n",
year, mon, mday, wday,
hour, min, sec );
printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
rtc_read (RTC_CONFIG_D) & 0x3F,
rtc_read (RTC_HOURS_ALARM),
rtc_read (RTC_MINUTES_ALARM),
rtc_read (RTC_SECONDS_ALARM) );
#endif
tmp->tm_sec = bcd2bin (sec & 0x7F);
tmp->tm_min = bcd2bin (min & 0x7F);
tmp->tm_hour = bcd2bin (hour & 0x3F);
tmp->tm_mday = bcd2bin (mday & 0x3F);
tmp->tm_mon = bcd2bin (mon & 0x1F);
tmp->tm_year = bcd2bin (year);
tmp->tm_wday = bcd2bin (wday & 0x07);
if(tmp->tm_year<70)
tmp->tm_year+=2000;
else
tmp->tm_year+=1900;
tmp->tm_yday = 0;
tmp->tm_isdst= 0;
#ifdef RTC_DEBUG
printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
return 0;
}
int rtc_set (struct rtc_time *tmp)
{
#ifdef RTC_DEBUG
printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
#endif
rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
return 0;
}
void rtc_reset (void)
{
rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
rtc_write(RTC_CONFIG_B,0x00);
rtc_write(RTC_CONFIG_B,0x00);
rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
}
/* ------------------------------------------------------------------------- */
#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
/*
* use direct memory access
*/
static uchar rtc_read (uchar reg)
{
return in8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg);
}
static void rtc_write (uchar reg, uchar val)
{
out8(CONFIG_SYS_RTC_REG_BASE_ADDR + reg, val);
}
#else
static uchar rtc_read (uchar reg)
{
out8(RTC_PORT_MC146818,reg);
return in8(RTC_PORT_MC146818 + 1);
}
static void rtc_write (uchar reg, uchar val)
{
out8(RTC_PORT_MC146818,reg);
out8(RTC_PORT_MC146818+1, val);
}
#endif
void rtc_init(void)
{
#if CLEAR_CMOS
int i;
rtc_write(RTC_SECONDS_ALARM, 0);
rtc_write(RTC_MINUTES_ALARM, 0);
rtc_write(RTC_HOURS_ALARM, 0);
for (i = RTC_CONFIG_A; i < RTC_REG_SIZE; i++)
rtc_write(i, 0);
printf("RTC: zeroing CMOS RAM\n");
#endif
/* Setup the real time clock */
rtc_write(RTC_CONFIG_B, RTC_CONFIG_B_24H);
/* Setup the frequency it operates at */
rtc_write(RTC_CONFIG_A, RTC_CONFIG_A_REF_CLCK_32KHZ |
RTC_CONFIG_A_RATE_1024HZ);
/* Ensure all reserved bits are 0 in register D */
rtc_write(RTC_CONFIG_D, RTC_CONFIG_D_VALID_RAM_AND_TIME);
/* Clear any pending interrupts */
rtc_read(RTC_CONFIG_C);
}
#endif
|
