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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* (C) Copyright 2007
* Matthias Fuchs, esd gmbh, matthias.fuchs@esd-electronics.com.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* Epson RX8025 RTC driver.
*/
#include <common.h>
#include <command.h>
#include <rtc.h>
#include <i2c.h>
#if defined(CONFIG_RTC_RX8025) && defined(CONFIG_CMD_DATE)
/*---------------------------------------------------------------------*/
#undef DEBUG_RTC
#ifdef DEBUG_RTC
#define DEBUGR(fmt,args...) printf(fmt ,##args)
#else
#define DEBUGR(fmt,args...)
#endif
/*---------------------------------------------------------------------*/
#ifndef CFG_I2C_RTC_ADDR
# define CFG_I2C_RTC_ADDR 0x32
#endif
/*
* RTC register addresses
*/
#define RTC_SEC_REG_ADDR 0x00
#define RTC_MIN_REG_ADDR 0x01
#define RTC_HR_REG_ADDR 0x02
#define RTC_DAY_REG_ADDR 0x03
#define RTC_DATE_REG_ADDR 0x04
#define RTC_MON_REG_ADDR 0x05
#define RTC_YR_REG_ADDR 0x06
#define RTC_CTL1_REG_ADDR 0x0e
#define RTC_CTL2_REG_ADDR 0x0f
/*
* Control register 1 bits
*/
#define RTC_CTL1_BIT_2412 0x20
/*
* Control register 2 bits
*/
#define RTC_CTL2_BIT_PON 0x10
#define RTC_CTL2_BIT_VDET 0x40
#define RTC_CTL2_BIT_XST 0x20
#define RTC_CTL2_BIT_VDSL 0x80
/*
* Note: the RX8025 I2C RTC requires register
* reads and write to consist of a single bus
* cycle. It is not allowed to write the register
* address in a first cycle that is terminated by
* a STOP condition. The chips needs a 'restart'
* sequence (start sequence without a prior stop).
* This driver has been written for a 4xx board.
* U-Boot's 4xx i2c driver is currently not capable
* to generate such cycles to some work arounds
* are used.
*/
/* static uchar rtc_read (uchar reg); */
#define rtc_read(reg) buf[((reg) + 1) & 0xf]
static void rtc_write (uchar reg, uchar val);
static uchar bin2bcd (unsigned int n);
static unsigned bcd2bin (uchar c);
/*
* Get the current time from the RTC
*/
int rtc_get (struct rtc_time *tmp)
{
int rel = 0;
uchar sec, min, hour, mday, wday, mon, year, ctl2;
uchar buf[16];
if (i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, 16))
printf("Error reading from RTC\n");
sec = rtc_read(RTC_SEC_REG_ADDR);
min = rtc_read(RTC_MIN_REG_ADDR);
hour = rtc_read(RTC_HR_REG_ADDR);
wday = rtc_read(RTC_DAY_REG_ADDR);
mday = rtc_read(RTC_DATE_REG_ADDR);
mon = rtc_read(RTC_MON_REG_ADDR);
year = rtc_read(RTC_YR_REG_ADDR);
DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
"hr: %02x min: %02x sec: %02x\n",
year, mon, mday, wday, hour, min, sec);
/* dump status */
ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
if (ctl2 & RTC_CTL2_BIT_PON) {
printf("RTC: power-on detected\n");
rel = -1;
}
if (ctl2 & RTC_CTL2_BIT_VDET) {
printf("RTC: voltage drop detected\n");
rel = -1;
}
if (!(ctl2 & RTC_CTL2_BIT_XST)) {
printf("RTC: oscillator stop detected\n");
rel = -1;
}
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) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
tmp->tm_wday = bcd2bin (wday & 0x07);
tmp->tm_yday = 0;
tmp->tm_isdst= 0;
DEBUGR ("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);
return rel;
}
/*
* Set the RTC
*/
void rtc_set (struct rtc_time *tmp)
{
DEBUGR ("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);
if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
printf("WARNING: year should be between 1970 and 2069!\n");
rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
rtc_write (RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);
}
/*
* Reset the RTC. We setting the date back to 1970-01-01.
*/
void rtc_reset (void)
{
struct rtc_time tmp;
uchar buf[16];
uchar ctl2;
if (i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, 16))
printf("Error reading from RTC\n");
ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
rtc_write (RTC_CTL2_REG_ADDR, ctl2);
tmp.tm_year = 1970;
tmp.tm_mon = 1;
tmp.tm_mday= 1;
tmp.tm_hour = 0;
tmp.tm_min = 0;
tmp.tm_sec = 0;
rtc_set(&tmp);
printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
return;
}
/*
* Helper functions
*/
static void rtc_write (uchar reg, uchar val)
{
uchar buf[2];
buf[0] = reg << 4;
buf[1] = val;
if (i2c_write(CFG_I2C_RTC_ADDR, 0, 0, buf, 2) != 0)
printf("Error writing to RTC\n");
}
static unsigned bcd2bin (uchar n)
{
return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
}
static unsigned char bin2bcd (unsigned int n)
{
return (((n / 10) << 4) | (n % 10));
}
#endif /* CONFIG_RTC_RX8025 && CONFIG_CMD_DATE */
|
