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 #ifndef CONFIG_SYS_MCFRTC_BASE
17 #error RTC_BASE is not defined!
18 #endif
19
20 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
21 #define STARTOFTIME 1970
22
rtc_get(struct rtc_time * tmp)23 int rtc_get(struct rtc_time *tmp)
24 {
25 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
26
27 int rtc_days, rtc_hrs, rtc_mins;
28 int tim;
29
30 rtc_days = rtc->days;
31 rtc_hrs = rtc->hourmin >> 8;
32 rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
33
34 tim = (rtc_days * 24) + rtc_hrs;
35 tim = (tim * 60) + rtc_mins;
36 tim = (tim * 60) + rtc->seconds;
37
38 rtc_to_tm(tim, tmp);
39
40 tmp->tm_yday = 0;
41 tmp->tm_isdst = 0;
42
43 #ifdef RTC_DEBUG
44 printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
45 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
46 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
47 #endif
48
49 return 0;
50 }
51
rtc_set(struct rtc_time * tmp)52 int rtc_set(struct rtc_time *tmp)
53 {
54 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
55
56 static int month_days[12] = {
57 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
58 };
59 int days, i, months;
60
61 if (tmp->tm_year > 2037) {
62 printf("Unable to handle. Exceeding integer limitation!\n");
63 tmp->tm_year = 2027;
64 }
65 #ifdef RTC_DEBUG
66 printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
67 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
68 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
69 #endif
70
71 /* calculate days by years */
72 for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
73 days += 365 + isleap(i);
74 }
75
76 /* calculate days by months */
77 months = tmp->tm_mon - 1;
78 for (i = 0; i < months; i++) {
79 days += month_days[i];
80
81 if (i == 1)
82 days += isleap(i);
83 }
84
85 days += tmp->tm_mday - 1;
86
87 rtc->days = days;
88 rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
89 rtc->seconds = tmp->tm_sec;
90
91 return 0;
92 }
93
rtc_reset(void)94 void rtc_reset(void)
95 {
96 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
97
98 if ((rtc->cr & RTC_CR_EN) == 0) {
99 printf("real-time-clock was stopped. Now starting...\n");
100 rtc->cr |= RTC_CR_EN;
101 }
102
103 rtc->cr |= RTC_CR_SWR;
104 }
105