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Commit | Line | Data |
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1 | /* | |
2 | * Date & Time support for Philips PCF8583 RTC | |
3 | */ | |
4 | ||
5 | #include "common.h" | |
6 | #include <stdlib.h> | |
7 | #include "debug.h" | |
8 | #include "command.h" | |
9 | #include "rtc.h" | |
10 | #include "i2c.h" | |
11 | ||
12 | #define DEBUG_RTC 0 | |
13 | ||
14 | #define debug_rtc(fmt, args...) \ | |
15 | debug_cond(DEBUG_RTC, fmt, ##args) | |
16 | ||
17 | #define REG_CS 0x00 /* control/status */ | |
18 | #define REG_CSEC 0x01 /* hundredth of a second */ | |
19 | #define REG_SEC 0x02 /* seconds */ | |
20 | #define REG_MIN 0x03 /* minutes */ | |
21 | #define REG_HOUR 0x04 /* hours */ | |
22 | #define REG_YRDATE 0x05 /* year/date */ | |
23 | #define REG_WDMON 0x06 /* weekdays/months */ | |
24 | #define NR_OF_REGS 7 | |
25 | ||
26 | ||
27 | /* ------------------------------------------------------------------------- */ | |
28 | ||
29 | static uint_fast8_t bcd2bin(uint8_t val) | |
30 | { | |
31 | return (val >> 4) * 10 + (val & 0x0f); | |
32 | } | |
33 | ||
34 | static uint8_t bin2bcd (uint_fast8_t val) | |
35 | { | |
36 | div_t d = div(val, 10); | |
37 | ||
38 | return (d.quot << 4) | d.rem; | |
39 | } | |
40 | ||
41 | ||
42 | int rtc_get (struct rtc_time *tmp) | |
43 | { | |
44 | int rel = 0; | |
45 | uint8_t rtcbuf[NR_OF_REGS]; | |
46 | uint16_t year; | |
47 | ||
48 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, NR_OF_REGS); | |
49 | i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &year, 2); | |
50 | ||
51 | debug_rtc("Get RTC year: %u, year/date: %02x, wdays/month: %02x, " | |
52 | "hour: %02x, min: %02x, sec: %02x, (stat: %02x)\n", year, | |
53 | rtcbuf[6], rtcbuf[5], rtcbuf[4], rtcbuf[3], rtcbuf[2], rtcbuf[0]); | |
54 | ||
55 | tmp->tm_sec = bcd2bin (rtcbuf[REG_SEC] & 0x7F); | |
56 | tmp->tm_min = bcd2bin (rtcbuf[REG_MIN] & 0x7F); | |
57 | tmp->tm_hour = bcd2bin (rtcbuf[REG_HOUR] & 0x3F); | |
58 | tmp->tm_mday = bcd2bin (rtcbuf[REG_YRDATE] & 0x3F); | |
59 | tmp->tm_mon = bcd2bin (rtcbuf[REG_WDMON] & 0x1F); | |
60 | while (year%4 < (rtcbuf[REG_YRDATE]>>6)) { | |
61 | year++; | |
62 | /* TODO: update RTC ram */ | |
63 | } | |
64 | tmp->tm_year = year; | |
65 | tmp->tm_wday = rtcbuf[REG_WDMON] >> 5; | |
66 | tmp->tm_yday = 0; | |
67 | tmp->tm_isdst= 0; | |
68 | ||
69 | ||
70 | debug_rtc( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
71 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, | |
72 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); | |
73 | ||
74 | return rel; | |
75 | } | |
76 | ||
77 | int rtc_set (struct rtc_time *tmp) | |
78 | { | |
79 | uint8_t rtcbuf[NR_OF_REGS]; | |
80 | ||
81 | debug_rtc("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
82 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, | |
83 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); | |
84 | ||
85 | rtcbuf[REG_CS] = 0x84; | |
86 | rtcbuf[REG_CSEC] = 0x00; | |
87 | rtcbuf[REG_WDMON ] = bin2bcd(tmp->tm_mon) | ((tmp->tm_wday) << 5); | |
88 | rtcbuf[REG_YRDATE] = ((tmp->tm_year % 4) << 6) | bin2bcd(tmp->tm_mday); | |
89 | rtcbuf[REG_HOUR ] = bin2bcd(tmp->tm_hour); | |
90 | rtcbuf[REG_MIN ] = bin2bcd(tmp->tm_min); | |
91 | rtcbuf[REG_SEC ] = bin2bcd(tmp->tm_sec); | |
92 | ||
93 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, NR_OF_REGS); | |
94 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &tmp->tm_year, 2); | |
95 | rtcbuf[REG_CS] = 0x04; | |
96 | i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, 1); | |
97 | ||
98 | ||
99 | return 0; | |
100 | } |