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trem78befb62012-08-08 07:04:46 +00001/*
2 * Freescale i.MX27 RTC Driver
3 *
4 * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
5 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02006 * SPDX-License-Identifier: GPL-2.0+
trem78befb62012-08-08 07:04:46 +00007 */
8
9#include <common.h>
10#include <rtc.h>
11#include <asm/io.h>
12#include <asm/arch/imx-regs.h>
13
14#define HOUR_SHIFT 8
15#define HOUR_MASK 0x1f
16#define MIN_SHIFT 0
17#define MIN_MASK 0x3f
18
19int rtc_get(struct rtc_time *time)
20{
21 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
22 uint32_t day, hour, min, sec;
23
24 day = readl(&rtc_regs->dayr);
25 hour = readl(&rtc_regs->hourmin);
26 sec = readl(&rtc_regs->seconds);
27
28 min = (hour >> MIN_SHIFT) & MIN_MASK;
29 hour = (hour >> HOUR_SHIFT) & HOUR_MASK;
30
31 sec += min * 60 + hour * 3600 + day * 24 * 3600;
32
33 to_tm(sec, time);
34
35 return 0;
36}
37
38int rtc_set(struct rtc_time *time)
39{
40 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
41 uint32_t day, hour, min, sec;
42
43 sec = mktime(time->tm_year, time->tm_mon, time->tm_mday,
44 time->tm_hour, time->tm_min, time->tm_sec);
45
46 day = sec / (24 * 3600);
47 sec = sec % (24 * 3600);
48 hour = sec / 3600;
49 sec = sec % 3600;
50 min = sec / 60;
51 sec = sec % 60;
52
53 hour = (hour & HOUR_MASK) << HOUR_SHIFT;
54 hour |= (min & MIN_MASK) << MIN_SHIFT;
55
56 writel(day, &rtc_regs->dayr);
57 writel(hour, &rtc_regs->hourmin);
58 writel(sec, &rtc_regs->seconds);
59
60 return 0;
61}
62
63void rtc_reset(void)
64{
65 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
66
67 writel(0, &rtc_regs->dayr);
68 writel(0, &rtc_regs->hourmin);
69 writel(0, &rtc_regs->seconds);
70}