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12#include <common.h>
13#include <command.h>
14#include <rtc.h>
15#include <i2c.h>
16
17#if defined(CONFIG_CMD_DATE)
18
19
20#undef DEBUG_RTC
21
22#ifdef DEBUG_RTC
23#define DEBUGR(fmt,args...) printf(fmt ,##args)
24#else
25#define DEBUGR(fmt,args...)
26#endif
27
28
29#ifndef CONFIG_SYS_I2C_RTC_ADDR
30# define CONFIG_SYS_I2C_RTC_ADDR 0x32
31#endif
32
33
34
35
36#define RTC_SEC_REG_ADDR 0x00
37#define RTC_MIN_REG_ADDR 0x01
38#define RTC_HR_REG_ADDR 0x02
39#define RTC_DAY_REG_ADDR 0x03
40#define RTC_DATE_REG_ADDR 0x04
41#define RTC_MON_REG_ADDR 0x05
42#define RTC_YR_REG_ADDR 0x06
43
44#define RTC_CTL1_REG_ADDR 0x0e
45#define RTC_CTL2_REG_ADDR 0x0f
46
47
48
49
50#define RTC_CTL1_BIT_2412 0x20
51
52
53
54
55#define RTC_CTL2_BIT_PON 0x10
56#define RTC_CTL2_BIT_VDET 0x40
57#define RTC_CTL2_BIT_XST 0x20
58#define RTC_CTL2_BIT_VDSL 0x80
59
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72
73
74#define rtc_read(reg) buf[((reg) + 1) & 0xf]
75
76static void rtc_write (uchar reg, uchar val);
77
78
79
80
81int rtc_get (struct rtc_time *tmp)
82{
83 int rel = 0;
84 uchar sec, min, hour, mday, wday, mon, year, ctl2;
85 uchar buf[16];
86
87 if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16))
88 printf("Error reading from RTC\n");
89
90 sec = rtc_read(RTC_SEC_REG_ADDR);
91 min = rtc_read(RTC_MIN_REG_ADDR);
92 hour = rtc_read(RTC_HR_REG_ADDR);
93 wday = rtc_read(RTC_DAY_REG_ADDR);
94 mday = rtc_read(RTC_DATE_REG_ADDR);
95 mon = rtc_read(RTC_MON_REG_ADDR);
96 year = rtc_read(RTC_YR_REG_ADDR);
97
98 DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
99 "hr: %02x min: %02x sec: %02x\n",
100 year, mon, mday, wday, hour, min, sec);
101
102
103 ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
104 if (ctl2 & RTC_CTL2_BIT_PON) {
105 printf("RTC: power-on detected\n");
106 rel = -1;
107 }
108
109 if (ctl2 & RTC_CTL2_BIT_VDET) {
110 printf("RTC: voltage drop detected\n");
111 rel = -1;
112 }
113
114 if (!(ctl2 & RTC_CTL2_BIT_XST)) {
115 printf("RTC: oscillator stop detected\n");
116 rel = -1;
117 }
118
119 tmp->tm_sec = bcd2bin (sec & 0x7F);
120 tmp->tm_min = bcd2bin (min & 0x7F);
121 if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412)
122 tmp->tm_hour = bcd2bin (hour & 0x3F);
123 else
124 tmp->tm_hour = bcd2bin (hour & 0x1F) % 12 +
125 ((hour & 0x20) ? 12 : 0);
126 tmp->tm_mday = bcd2bin (mday & 0x3F);
127 tmp->tm_mon = bcd2bin (mon & 0x1F);
128 tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
129 tmp->tm_wday = bcd2bin (wday & 0x07);
130 tmp->tm_yday = 0;
131 tmp->tm_isdst= 0;
132
133 DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
134 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
135 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
136
137 return rel;
138}
139
140
141
142
143int rtc_set (struct rtc_time *tmp)
144{
145 DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
146 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
147 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
148
149 if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
150 printf("WARNING: year should be between 1970 and 2069!\n");
151
152 rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
153 rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
154 rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
155 rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
156 rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
157 rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
158 rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
159
160 rtc_write (RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);
161
162 return 0;
163}
164
165
166
167
168void rtc_reset (void)
169{
170 struct rtc_time tmp;
171 uchar buf[16];
172 uchar ctl2;
173
174 if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16))
175 printf("Error reading from RTC\n");
176
177 ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
178 ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
179 ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
180 rtc_write (RTC_CTL2_REG_ADDR, ctl2);
181
182 tmp.tm_year = 1970;
183 tmp.tm_mon = 1;
184 tmp.tm_mday= 1;
185 tmp.tm_hour = 0;
186 tmp.tm_min = 0;
187 tmp.tm_sec = 0;
188
189 rtc_set(&tmp);
190
191 printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
192 tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
193 tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
194
195 return;
196}
197
198
199
200
201static void rtc_write (uchar reg, uchar val)
202{
203 uchar buf[2];
204 buf[0] = reg << 4;
205 buf[1] = val;
206 if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 2) != 0)
207 printf("Error writing to RTC\n");
208
209}
210
211#endif
212