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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
4 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
5 */
6
7#include <command.h>
8#include <rtc.h>
9#include <asm/immap.h>
10#include <asm/rtc.h>
11
12#undef RTC_DEBUG
13
14#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
15#define STARTOFTIME 1970
16
17int rtc_get(struct rtc_time *tmp)
18{
19 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
20
21 int rtc_days, rtc_hrs, rtc_mins;
22 int tim;
23
24 rtc_days = rtc->days;
25 rtc_hrs = rtc->hourmin >> 8;
26 rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
27
28 tim = (rtc_days * 24) + rtc_hrs;
29 tim = (tim * 60) + rtc_mins;
30 tim = (tim * 60) + rtc->seconds;
31
32 rtc_to_tm(tim, tmp);
33
34 tmp->tm_yday = 0;
35 tmp->tm_isdst = 0;
36
37#ifdef RTC_DEBUG
38 printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
39 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
40 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
41#endif
42
43 return 0;
44}
45
46int rtc_set(struct rtc_time *tmp)
47{
48 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
49
50 static int month_days[12] = {
51 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
52 };
53 int days, i, months;
54
55 if (tmp->tm_year > 2037) {
56 printf("Unable to handle. Exceeding integer limitation!\n");
57 tmp->tm_year = 2027;
58 }
59#ifdef RTC_DEBUG
60 printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
61 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
62 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
63#endif
64
65 /* calculate days by years */
66 for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
67 days += 365 + isleap(i);
68 }
69
70 /* calculate days by months */
71 months = tmp->tm_mon - 1;
72 for (i = 0; i < months; i++) {
73 days += month_days[i];
74
75 if (i == 1)
76 days += isleap(i);
77 }
78
79 days += tmp->tm_mday - 1;
80
81 rtc->days = days;
82 rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
83 rtc->seconds = tmp->tm_sec;
84
85 return 0;
86}
87
88void rtc_reset(void)
89{
90 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
91
92 if ((rtc->cr & RTC_CR_EN) == 0) {
93 printf("real-time-clock was stopped. Now starting...\n");
94 rtc->cr |= RTC_CR_EN;
95 }
96
97 rtc->cr |= RTC_CR_SWR;
98}