Commit 04e11cf383ff6231535fd981023bb1306b2133d4
Committed by
Wolfgang Denk
1 parent
572e6179ad
Exists in
master
and in
54 other branches
rtc: add support for 4543 RTC (manufactured by e.g. EPSON)
Signed-off-by: Detlev Zundel <dzu@denx.de> Signed-off-by: Andreas Pfefferle <ap@denx.de>
Showing 3 changed files with 123 additions and 0 deletions Side-by-side Diff
drivers/rtc/Makefile
... | ... | @@ -55,6 +55,7 @@ |
55 | 55 | COBJS-$(CONFIG_RTC_PCF8563) += pcf8563.o |
56 | 56 | COBJS-$(CONFIG_RTC_PL031) += pl031.o |
57 | 57 | COBJS-$(CONFIG_RTC_RS5C372A) += rs5c372.o |
58 | +COBJS-$(CONFIG_RTC_RTC4543) += rtc4543.o | |
58 | 59 | COBJS-$(CONFIG_RTC_RX8025) += rx8025.o |
59 | 60 | COBJS-$(CONFIG_RTC_S3C24X0) += s3c24x0_rtc.o |
60 | 61 | COBJS-$(CONFIG_RTC_X1205) += x1205.o |
drivers/rtc/rtc4543.c
1 | +/* | |
2 | + * (C) Copyright 2008, 2009 | |
3 | + * Andreas Pfefferle, DENX Software Engineering, ap@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 | +#include <asm/io.h> | |
25 | +#include <common.h> | |
26 | +#include <command.h> | |
27 | +#include <config.h> | |
28 | +#include <bcd.h> | |
29 | +#include <rtc.h> | |
30 | +#include <tws.h> | |
31 | + | |
32 | +#if defined(CONFIG_CMD_DATE) | |
33 | + | |
34 | +/* | |
35 | + * Note: The acrobatics below is due to the hideously ingenius idea of | |
36 | + * the chip designers. As the chip does not allow register | |
37 | + * addressing, all values need to be read and written in one go. Sure | |
38 | + * enough, the 'wday' field (0-6) is transferred using the economic | |
39 | + * number of 4 bits right in the middle of the packet..... | |
40 | + */ | |
41 | + | |
42 | +int rtc_get(struct rtc_time *tm) | |
43 | +{ | |
44 | + int rel = 0; | |
45 | + uchar buffer[7]; | |
46 | + | |
47 | + memset(buffer, 0, 7); | |
48 | + | |
49 | + /* Read 52 bits into our buffer */ | |
50 | + tws_read(buffer, 52); | |
51 | + | |
52 | + tm->tm_sec = BCD2BIN( buffer[0] & 0x7F); | |
53 | + tm->tm_min = BCD2BIN( buffer[1] & 0x7F); | |
54 | + tm->tm_hour = BCD2BIN( buffer[2] & 0x3F); | |
55 | + tm->tm_wday = BCD2BIN( buffer[3] & 0x07); | |
56 | + tm->tm_mday = BCD2BIN((buffer[3] & 0xF0) >> 4 | (buffer[4] & 0x0F) << 4); | |
57 | + tm->tm_mon = BCD2BIN((buffer[4] & 0x30) >> 4 | (buffer[5] & 0x0F) << 4); | |
58 | + tm->tm_year = BCD2BIN((buffer[5] & 0xF0) >> 4 | (buffer[6] & 0x0F) << 4) + 2000; | |
59 | + tm->tm_yday = 0; | |
60 | + tm->tm_isdst = 0; | |
61 | + | |
62 | + if (tm->tm_sec & 0x80) { | |
63 | + puts("### Warning: RTC Low Voltage - date/time not reliable\n"); | |
64 | + rel = -1; | |
65 | + } | |
66 | + | |
67 | + debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
68 | + tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, | |
69 | + tm->tm_hour, tm->tm_min, tm->tm_sec); | |
70 | + | |
71 | + return rel; | |
72 | +} | |
73 | + | |
74 | +int rtc_set(struct rtc_time *tm) | |
75 | +{ | |
76 | + uchar buffer[7]; | |
77 | + uchar tmp; | |
78 | + | |
79 | + debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
80 | + tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, | |
81 | + tm->tm_hour, tm->tm_min, tm->tm_sec); | |
82 | + | |
83 | + memset(buffer, 0, 7); | |
84 | + buffer[0] = BIN2BCD(tm->tm_sec); | |
85 | + buffer[1] = BIN2BCD(tm->tm_min); | |
86 | + buffer[2] = BIN2BCD(tm->tm_hour); | |
87 | + buffer[3] = BIN2BCD(tm->tm_wday); | |
88 | + tmp = BIN2BCD(tm->tm_mday); | |
89 | + buffer[3] |= (tmp & 0x0F) << 4; | |
90 | + buffer[4] = (tmp & 0xF0) >> 4; | |
91 | + tmp = BIN2BCD(tm->tm_mon); | |
92 | + buffer[4] |= (tmp & 0x0F) << 4; | |
93 | + buffer[5] = (tmp & 0xF0) >> 4; | |
94 | + tmp = BIN2BCD(tm->tm_year % 100); | |
95 | + buffer[5] |= (tmp & 0x0F) << 4; | |
96 | + buffer[6] = (tmp & 0xF0) >> 4; | |
97 | + | |
98 | + /* Write the resulting 52 bits to device */ | |
99 | + tws_write(buffer, 52); | |
100 | + | |
101 | + return 0; | |
102 | +} | |
103 | + | |
104 | +void rtc_reset(void) | |
105 | +{ | |
106 | + struct rtc_time tmp; | |
107 | + | |
108 | + tmp.tm_sec = 0; | |
109 | + tmp.tm_min = 0; | |
110 | + tmp.tm_hour = 0; | |
111 | + tmp.tm_wday = 4; | |
112 | + tmp.tm_mday = 1; | |
113 | + tmp.tm_mon = 1; | |
114 | + tmp.tm_year = 2000; | |
115 | + rtc_set(&tmp); | |
116 | +} | |
117 | + | |
118 | +#endif |
include/rtc.h
... | ... | @@ -61,5 +61,9 @@ |
61 | 61 | unsigned long mktime (unsigned int, unsigned int, unsigned int, |
62 | 62 | unsigned int, unsigned int, unsigned int); |
63 | 63 | |
64 | +uchar rtc_read(uchar reg) __attribute__((weak)); | |
65 | +void rtc_write(uchar reg, uchar val) __attribute__((weak)); | |
66 | + | |
67 | + | |
64 | 68 | #endif /* _RTC_H_ */ |