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 #if defined(CONFIG_CMD_DATE)
10
11 #include <command.h>
12 #include <rtc.h>
13 #include <asm/immap.h>
14 #include <asm/rtc.h>
15
16 #undef RTC_DEBUG
17
18 #ifndef CONFIG_SYS_MCFRTC_BASE
19 #error RTC_BASE is not defined!
20 #endif
21
22 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
23 #define STARTOFTIME 1970
24
rtc_get(struct rtc_time * tmp)25 int rtc_get(struct rtc_time *tmp)
26 {
27 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
28
29 int rtc_days, rtc_hrs, rtc_mins;
30 int tim;
31
32 rtc_days = rtc->days;
33 rtc_hrs = rtc->hourmin >> 8;
34 rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
35
36 tim = (rtc_days * 24) + rtc_hrs;
37 tim = (tim * 60) + rtc_mins;
38 tim = (tim * 60) + rtc->seconds;
39
40 rtc_to_tm(tim, tmp);
41
42 tmp->tm_yday = 0;
43 tmp->tm_isdst = 0;
44
45 #ifdef RTC_DEBUG
46 printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
47 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
48 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
49 #endif
50
51 return 0;
52 }
53
rtc_set(struct rtc_time * tmp)54 int rtc_set(struct rtc_time *tmp)
55 {
56 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
57
58 static int month_days[12] = {
59 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
60 };
61 int days, i, months;
62
63 if (tmp->tm_year > 2037) {
64 printf("Unable to handle. Exceeding integer limitation!\n");
65 tmp->tm_year = 2027;
66 }
67 #ifdef RTC_DEBUG
68 printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
69 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
70 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
71 #endif
72
73 /* calculate days by years */
74 for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
75 days += 365 + isleap(i);
76 }
77
78 /* calculate days by months */
79 months = tmp->tm_mon - 1;
80 for (i = 0; i < months; i++) {
81 days += month_days[i];
82
83 if (i == 1)
84 days += isleap(i);
85 }
86
87 days += tmp->tm_mday - 1;
88
89 rtc->days = days;
90 rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
91 rtc->seconds = tmp->tm_sec;
92
93 return 0;
94 }
95
rtc_reset(void)96 void rtc_reset(void)
97 {
98 volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
99
100 if ((rtc->cr & RTC_CR_EN) == 0) {
101 printf("real-time-clock was stopped. Now starting...\n");
102 rtc->cr |= RTC_CR_EN;
103 }
104
105 rtc->cr |= RTC_CR_SWR;
106 }
107
108 #endif /* CONFIG_MCFRTC && CONFIG_CMD_DATE */
109