]>
Commit | Line | Data |
---|---|---|
04e11cf3 DZ |
1 | /* |
2 | * (C) Copyright 2008, 2009 | |
3 | * Andreas Pfefferle, DENX Software Engineering, ap@denx.de. | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
04e11cf3 DZ |
6 | */ |
7 | ||
8 | #include <asm/io.h> | |
9 | #include <common.h> | |
10 | #include <command.h> | |
11 | #include <config.h> | |
04e11cf3 DZ |
12 | #include <rtc.h> |
13 | #include <tws.h> | |
14 | ||
15 | #if defined(CONFIG_CMD_DATE) | |
16 | ||
17 | /* | |
18 | * Note: The acrobatics below is due to the hideously ingenius idea of | |
19 | * the chip designers. As the chip does not allow register | |
20 | * addressing, all values need to be read and written in one go. Sure | |
21 | * enough, the 'wday' field (0-6) is transferred using the economic | |
22 | * number of 4 bits right in the middle of the packet..... | |
23 | */ | |
24 | ||
25 | int rtc_get(struct rtc_time *tm) | |
26 | { | |
27 | int rel = 0; | |
28 | uchar buffer[7]; | |
29 | ||
30 | memset(buffer, 0, 7); | |
31 | ||
32 | /* Read 52 bits into our buffer */ | |
33 | tws_read(buffer, 52); | |
34 | ||
e84aba13 AT |
35 | tm->tm_sec = bcd2bin( buffer[0] & 0x7F); |
36 | tm->tm_min = bcd2bin( buffer[1] & 0x7F); | |
37 | tm->tm_hour = bcd2bin( buffer[2] & 0x3F); | |
38 | tm->tm_wday = bcd2bin( buffer[3] & 0x07); | |
39 | tm->tm_mday = bcd2bin((buffer[3] & 0xF0) >> 4 | (buffer[4] & 0x0F) << 4); | |
40 | tm->tm_mon = bcd2bin((buffer[4] & 0x30) >> 4 | (buffer[5] & 0x0F) << 4); | |
41 | tm->tm_year = bcd2bin((buffer[5] & 0xF0) >> 4 | (buffer[6] & 0x0F) << 4) + 2000; | |
04e11cf3 DZ |
42 | tm->tm_yday = 0; |
43 | tm->tm_isdst = 0; | |
44 | ||
45 | if (tm->tm_sec & 0x80) { | |
46 | puts("### Warning: RTC Low Voltage - date/time not reliable\n"); | |
47 | rel = -1; | |
48 | } | |
49 | ||
50 | debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
51 | tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, | |
52 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
53 | ||
54 | return rel; | |
55 | } | |
56 | ||
57 | int rtc_set(struct rtc_time *tm) | |
58 | { | |
59 | uchar buffer[7]; | |
60 | uchar tmp; | |
61 | ||
62 | debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
63 | tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, | |
64 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
65 | ||
66 | memset(buffer, 0, 7); | |
e84aba13 AT |
67 | buffer[0] = bin2bcd(tm->tm_sec); |
68 | buffer[1] = bin2bcd(tm->tm_min); | |
69 | buffer[2] = bin2bcd(tm->tm_hour); | |
70 | buffer[3] = bin2bcd(tm->tm_wday); | |
71 | tmp = bin2bcd(tm->tm_mday); | |
04e11cf3 DZ |
72 | buffer[3] |= (tmp & 0x0F) << 4; |
73 | buffer[4] = (tmp & 0xF0) >> 4; | |
e84aba13 | 74 | tmp = bin2bcd(tm->tm_mon); |
04e11cf3 DZ |
75 | buffer[4] |= (tmp & 0x0F) << 4; |
76 | buffer[5] = (tmp & 0xF0) >> 4; | |
e84aba13 | 77 | tmp = bin2bcd(tm->tm_year % 100); |
04e11cf3 DZ |
78 | buffer[5] |= (tmp & 0x0F) << 4; |
79 | buffer[6] = (tmp & 0xF0) >> 4; | |
80 | ||
81 | /* Write the resulting 52 bits to device */ | |
82 | tws_write(buffer, 52); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | void rtc_reset(void) | |
88 | { | |
89 | struct rtc_time tmp; | |
90 | ||
91 | tmp.tm_sec = 0; | |
92 | tmp.tm_min = 0; | |
93 | tmp.tm_hour = 0; | |
94 | tmp.tm_wday = 4; | |
95 | tmp.tm_mday = 1; | |
96 | tmp.tm_mon = 1; | |
97 | tmp.tm_year = 2000; | |
98 | rtc_set(&tmp); | |
99 | } | |
100 | ||
101 | #endif |