diff options
Diffstat (limited to 'firmware/drivers/rtc/rtc_s35380a.c')
-rw-r--r-- | firmware/drivers/rtc/rtc_s35380a.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/firmware/drivers/rtc/rtc_s35380a.c b/firmware/drivers/rtc/rtc_s35380a.c new file mode 100644 index 0000000000..7a7bf81118 --- /dev/null +++ b/firmware/drivers/rtc/rtc_s35380a.c | |||
@@ -0,0 +1,128 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * adopted for HD300 by Marcin Bukat | ||
11 | * Copyright (C) 2009 by Bertrik Sikken | ||
12 | * Copyright (C) 2008 by Robert Kukla | ||
13 | * | ||
14 | * This program is free software; you can redistribute it and/or | ||
15 | * modify it under the terms of the GNU General Public License | ||
16 | * as published by the Free Software Foundation; either version 2 | ||
17 | * of the License, or (at your option) any later version. | ||
18 | * | ||
19 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
20 | * KIND, either express or implied. | ||
21 | * | ||
22 | ****************************************************************************/ | ||
23 | #include "config.h" | ||
24 | #include "rtc.h" | ||
25 | #include "i2c-coldfire.h" | ||
26 | |||
27 | /* Driver for the Seiko S35380A real-time clock chip with i2c interface | ||
28 | |||
29 | This driver was derived from rtc_s3539a.c and adapted for the MPIO HD300 | ||
30 | */ | ||
31 | |||
32 | #define RTC_ADDR 0x60 | ||
33 | |||
34 | #define STATUS_REG1 0 | ||
35 | #define STATUS_REG2 1 | ||
36 | #define REALTIME_DATA1 2 | ||
37 | #define REALTIME_DATA2 3 | ||
38 | #define INT1_REG 4 | ||
39 | #define INT2_REG 5 | ||
40 | #define CLOCK_CORR_REG 6 | ||
41 | #define FREE_REG 7 | ||
42 | |||
43 | /* STATUS_REG1 flags */ | ||
44 | #define STATUS_REG1_POC 0x80 | ||
45 | #define STATUS_REG1_BLD 0x40 | ||
46 | #define STATUS_REG1_INT2 0x20 | ||
47 | #define STATUS_REG1_INT1 0x10 | ||
48 | #define STATUS_REG1_SC1 0x08 | ||
49 | #define STATUS_REG1_SC0 0x04 | ||
50 | #define STATUS_REG1_H1224 0x02 | ||
51 | #define STATUS_REG1_RESET 0x01 | ||
52 | |||
53 | |||
54 | static void reverse_bits(unsigned char* v, int size) | ||
55 | { | ||
56 | static const unsigned char flipnibble[] = | ||
57 | {0x00, 0x08, 0x04, 0x0C, 0x02, 0x0A, 0x06, 0x0E, | ||
58 | 0x01, 0x09, 0x05, 0x0D, 0x03, 0x0B, 0x07, 0x0F}; | ||
59 | int i; | ||
60 | |||
61 | for (i = 0; i < size; i++) { | ||
62 | v[i] = (flipnibble[v[i] & 0x0F] << 4) | | ||
63 | flipnibble[(v[i] >> 4) & 0x0F]; | ||
64 | } | ||
65 | } | ||
66 | |||
67 | void rtc_init(void) | ||
68 | { | ||
69 | unsigned char status_reg; | ||
70 | i2c_read(I2C_IFACE_1, RTC_ADDR | (STATUS_REG1<<1), &status_reg, 1); | ||
71 | |||
72 | if ( (status_reg & STATUS_REG1_POC) || | ||
73 | (status_reg & STATUS_REG1_BLD) ) | ||
74 | { | ||
75 | /* perform rtc reset*/ | ||
76 | status_reg |= STATUS_REG1_RESET; | ||
77 | i2c_write(I2C_IFACE_1, RTC_ADDR | (STATUS_REG1<<1), &status_reg, 1); | ||
78 | } | ||
79 | } | ||
80 | |||
81 | int rtc_read_datetime(struct tm *tm) | ||
82 | { | ||
83 | unsigned char buf[7]; | ||
84 | unsigned int i; | ||
85 | int ret; | ||
86 | |||
87 | ret = i2c_read(I2C_IFACE_1, RTC_ADDR | (REALTIME_DATA1<<1), buf, sizeof(buf)); | ||
88 | reverse_bits(buf, sizeof(buf)); | ||
89 | |||
90 | buf[4] &= 0x3f; /* mask out p.m. flag */ | ||
91 | |||
92 | for (i = 0; i < sizeof(buf); i++) | ||
93 | buf[i] = BCD2DEC(buf[i]); | ||
94 | |||
95 | tm->tm_sec = buf[6]; | ||
96 | tm->tm_min = buf[5]; | ||
97 | tm->tm_hour = buf[4]; | ||
98 | tm->tm_wday = buf[3]; | ||
99 | tm->tm_mday = buf[2]; | ||
100 | tm->tm_mon = buf[1] - 1; | ||
101 | tm->tm_year = buf[0] + 100; | ||
102 | |||
103 | return ret; | ||
104 | } | ||
105 | |||
106 | int rtc_write_datetime(const struct tm *tm) | ||
107 | { | ||
108 | unsigned char buf[7]; | ||
109 | unsigned int i; | ||
110 | int ret; | ||
111 | |||
112 | buf[6] = tm->tm_sec; | ||
113 | buf[5] = tm->tm_min; | ||
114 | buf[4] = tm->tm_hour; | ||
115 | buf[3] = tm->tm_wday; | ||
116 | buf[2] = tm->tm_mday; | ||
117 | buf[1] = tm->tm_mon + 1; | ||
118 | buf[0] = tm->tm_year - 100; | ||
119 | |||
120 | for (i = 0; i < sizeof(buf); i++) | ||
121 | buf[i] = DEC2BCD(buf[i]); | ||
122 | |||
123 | reverse_bits(buf, sizeof(buf)); | ||
124 | ret = i2c_write(I2C_IFACE_1, RTC_ADDR | (REALTIME_DATA1<<1), buf, sizeof(buf)); | ||
125 | |||
126 | return ret; | ||
127 | } | ||
128 | |||