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 <common.h>
8
9 #include <command.h>
10 #include <rtc.h>
11 #include <asm/immap.h>
12 #include <asm/rtc.h>
13
14 #undef RTC_DEBUG
15
16 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
17 #define STARTOFTIME 1970
18
rtc_get(struct rtc_time * tmp)19 int rtc_get(struct rtc_time *tmp)
20 {
21 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
22
23 int rtc_days, rtc_hrs, rtc_mins;
24 int tim;
25
26 rtc_days = rtc->days;
27 rtc_hrs = rtc->hourmin >> 8;
28 rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
29
30 tim = (rtc_days * 24) + rtc_hrs;
31 tim = (tim * 60) + rtc_mins;
32 tim = (tim * 60) + rtc->seconds;
33
34 rtc_to_tm(tim, tmp);
35
36 tmp->tm_yday = 0;
37 tmp->tm_isdst = 0;
38
39 #ifdef RTC_DEBUG
40 printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
41 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
42 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
43 #endif
44
45 return 0;
46 }
47
rtc_set(struct rtc_time * tmp)48 int rtc_set(struct rtc_time *tmp)
49 {
50 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
51
52 static int month_days[12] = {
53 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
54 };
55 int days, i, months;
56
57 if (tmp->tm_year > 2037) {
58 printf("Unable to handle. Exceeding integer limitation!\n");
59 tmp->tm_year = 2027;
60 }
61 #ifdef RTC_DEBUG
62 printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
63 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
64 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
65 #endif
66
67 /* calculate days by years */
68 for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
69 days += 365 + isleap(i);
70 }
71
72 /* calculate days by months */
73 months = tmp->tm_mon - 1;
74 for (i = 0; i < months; i++) {
75 days += month_days[i];
76
77 if (i == 1)
78 days += isleap(i);
79 }
80
81 days += tmp->tm_mday - 1;
82
83 rtc->days = days;
84 rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
85 rtc->seconds = tmp->tm_sec;
86
87 return 0;
88 }
89
rtc_reset(void)90 void rtc_reset(void)
91 {
92 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
93
94 if ((rtc->cr & RTC_CR_EN) == 0) {
95 printf("real-time-clock was stopped. Now starting...\n");
96 rtc->cr |= RTC_CR_EN;
97 }
98
99 rtc->cr |= RTC_CR_SWR;
100 }
101