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4c0d4c3b WD |
1 | /* |
2 | * (C) Copyright 2004 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
5 | * See file CREDITS for list of people who contributed to this | |
6 | * project. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
21 | * MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | /* | |
25 | * Date & Time support for MAXIM MAX6900 RTC | |
26 | */ | |
27 | ||
28 | /* #define DEBUG */ | |
29 | ||
30 | #include <common.h> | |
31 | #include <command.h> | |
32 | #include <rtc.h> | |
33 | #include <i2c.h> | |
34 | ||
871c18dd | 35 | #if defined(CONFIG_CMD_DATE) |
4c0d4c3b | 36 | |
6d0f6bcf JCPV |
37 | #ifndef CONFIG_SYS_I2C_RTC_ADDR |
38 | #define CONFIG_SYS_I2C_RTC_ADDR 0x50 | |
4c0d4c3b WD |
39 | #endif |
40 | ||
41 | /* ------------------------------------------------------------------------- */ | |
42 | ||
43 | static uchar rtc_read (uchar reg) | |
44 | { | |
6d0f6bcf | 45 | return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg)); |
4c0d4c3b WD |
46 | } |
47 | ||
48 | static void rtc_write (uchar reg, uchar val) | |
49 | { | |
6d0f6bcf | 50 | i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); |
4c0d4c3b WD |
51 | udelay(2500); |
52 | } | |
53 | ||
4c0d4c3b WD |
54 | /* ------------------------------------------------------------------------- */ |
55 | ||
b73a19e1 | 56 | int rtc_get (struct rtc_time *tmp) |
4c0d4c3b WD |
57 | { |
58 | uchar sec, min, hour, mday, wday, mon, cent, year; | |
59 | int retry = 1; | |
60 | ||
61 | do { | |
62 | sec = rtc_read (0x80); | |
63 | min = rtc_read (0x82); | |
64 | hour = rtc_read (0x84); | |
65 | mday = rtc_read (0x86); | |
66 | mon = rtc_read (0x88); | |
67 | wday = rtc_read (0x8a); | |
68 | year = rtc_read (0x8c); | |
69 | cent = rtc_read (0x92); | |
70 | /* | |
71 | * Check for seconds rollover | |
72 | */ | |
73 | if ((sec != 59) || (rtc_read(0x80) == sec)){ | |
74 | retry = 0; | |
75 | } | |
76 | } while (retry); | |
77 | ||
78 | debug ( "Get RTC year: %02x mon: %02x cent: %02x mday: %02x wday: %02x " | |
79 | "hr: %02x min: %02x sec: %02x\n", | |
80 | year, mon, cent, mday, wday, | |
81 | hour, min, sec ); | |
82 | ||
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_year = bcd2bin (year) + bcd2bin(cent) * 100; | |
89 | tmp->tm_wday = bcd2bin (wday & 0x07); | |
90 | tmp->tm_yday = 0; | |
91 | tmp->tm_isdst= 0; | |
92 | ||
93 | debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
94 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, | |
95 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); | |
b73a19e1 YT |
96 | |
97 | return 0; | |
4c0d4c3b WD |
98 | } |
99 | ||
d1e23194 | 100 | int rtc_set (struct rtc_time *tmp) |
4c0d4c3b WD |
101 | { |
102 | ||
103 | debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
104 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, | |
105 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); | |
106 | ||
107 | rtc_write (0x9E, 0x00); | |
108 | rtc_write (0x80, 0); /* Clear seconds to ensure no rollover */ | |
109 | rtc_write (0x92, bin2bcd(tmp->tm_year / 100)); | |
110 | rtc_write (0x8c, bin2bcd(tmp->tm_year % 100)); | |
111 | rtc_write (0x8a, bin2bcd(tmp->tm_wday)); | |
112 | rtc_write (0x88, bin2bcd(tmp->tm_mon)); | |
113 | rtc_write (0x86, bin2bcd(tmp->tm_mday)); | |
114 | rtc_write (0x84, bin2bcd(tmp->tm_hour)); | |
115 | rtc_write (0x82, bin2bcd(tmp->tm_min )); | |
116 | rtc_write (0x80, bin2bcd(tmp->tm_sec )); | |
d1e23194 JCPV |
117 | |
118 | return 0; | |
4c0d4c3b WD |
119 | } |
120 | ||
121 | void rtc_reset (void) | |
122 | { | |
123 | } | |
124 | ||
068b60a0 | 125 | #endif |