blob: ce4f1711dcf326a8f84a272d21fc387ec36b2bf2 [file] [log] [blame]
Mike Frysingerb58d8b42008-02-04 19:26:57 -05001/*
2 * Copyright (c) 2004-2008 Analog Devices Inc.
3 *
4 * (C) Copyright 2001
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
6 *
7 * Licensed under the GPL-2 or later.
8 */
9
10#include <common.h>
11#include <command.h>
12#include <rtc.h>
13
14#if defined(CONFIG_RTC_BFIN) && defined(CONFIG_CMD_DATE)
15
16#include <asm/blackfin.h>
17#include <asm/mach-common/bits/rtc.h>
18
19#define pr_stamp() debug("%s:%s:%i: here i am\n", __FILE__, __func__, __LINE__)
20
21#define MIN_TO_SECS(x) (60 * (x))
22#define HRS_TO_SECS(x) (60 * MIN_TO_SECS(x))
23#define DAYS_TO_SECS(x) (24 * HRS_TO_SECS(x))
24
25#define NUM_SECS_IN_MIN MIN_TO_SECS(1)
26#define NUM_SECS_IN_HR HRS_TO_SECS(1)
27#define NUM_SECS_IN_DAY DAYS_TO_SECS(1)
28
29/* Our on-chip RTC has no notion of "reset" */
30void rtc_reset(void)
31{
32 return;
33}
34
35/* Wait for pending writes to complete */
36static void wait_for_complete(void)
37{
38 pr_stamp();
39 while (!(bfin_read_RTC_ISTAT() & WRITE_COMPLETE))
40 if (!(bfin_read_RTC_ISTAT() & WRITE_PENDING))
41 break;
42 bfin_write_RTC_ISTAT(WRITE_COMPLETE);
43}
44
45/* Enable the RTC prescaler enable register */
46int rtc_init(void)
47{
48 pr_stamp();
49 bfin_write_RTC_PREN(0x1);
50 return 0;
51}
52
53/* Set the time. Get the time_in_secs which is the number of seconds since Jan 1970 and set the RTC registers
54 * based on this value.
55 */
56void rtc_set(struct rtc_time *tmp)
57{
58 unsigned long remain, days, hrs, mins, secs;
59
60 pr_stamp();
61
62 if (tmp == NULL) {
63 puts("Error setting the date/time\n");
64 return;
65 }
66
67 wait_for_complete();
68
69 /* Calculate number of seconds this incoming time represents */
70 remain = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
71 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
72
73 /* Figure out how many days since epoch */
74 days = remain / NUM_SECS_IN_DAY;
75
76 /* From the remaining secs, compute the hrs(0-23), mins(0-59) and secs(0-59) */
77 remain = remain % NUM_SECS_IN_DAY;
78 hrs = remain / NUM_SECS_IN_HR;
79 remain = remain % NUM_SECS_IN_HR;
80 mins = remain / NUM_SECS_IN_MIN;
81 secs = remain % NUM_SECS_IN_MIN;
82
83 /* Encode these time values into our RTC_STAT register */
84 bfin_write_RTC_STAT(SET_ALARM(days, hrs, mins, secs));
85}
86
87/* Read the time from the RTC_STAT. time_in_seconds is seconds since Jan 1970 */
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030088int rtc_get(struct rtc_time *tmp)
Mike Frysingerb58d8b42008-02-04 19:26:57 -050089{
90 uint32_t cur_rtc_stat;
91 int time_in_sec;
92 int tm_sec, tm_min, tm_hr, tm_day;
93
94 pr_stamp();
95
96 if (tmp == NULL) {
97 puts("Error getting the date/time\n");
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030098 return -1;
Mike Frysingerb58d8b42008-02-04 19:26:57 -050099 }
100
101 wait_for_complete();
102
103 /* Read the RTC_STAT register */
104 cur_rtc_stat = bfin_read_RTC_STAT();
105
106 /* Convert our encoded format into actual time values */
107 tm_sec = (cur_rtc_stat & RTC_SEC) >> RTC_SEC_P;
108 tm_min = (cur_rtc_stat & RTC_MIN) >> RTC_MIN_P;
109 tm_hr = (cur_rtc_stat & RTC_HR ) >> RTC_HR_P;
110 tm_day = (cur_rtc_stat & RTC_DAY) >> RTC_DAY_P;
111
112 /* Calculate the total number of seconds since epoch */
113 time_in_sec = (tm_sec) + MIN_TO_SECS(tm_min) + HRS_TO_SECS(tm_hr) + DAYS_TO_SECS(tm_day);
114 to_tm(time_in_sec, tmp);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300115
116 return 0;
Mike Frysingerb58d8b42008-02-04 19:26:57 -0500117}
118
119#endif