1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Freescale i.MX27 RTC Driver
4 *
5 * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
6 */
7
8 #include <common.h>
9 #include <rtc.h>
10 #include <asm/io.h>
11 #include <asm/arch/imx-regs.h>
12
13 #define HOUR_SHIFT 8
14 #define HOUR_MASK 0x1f
15 #define MIN_SHIFT 0
16 #define MIN_MASK 0x3f
17
rtc_get(struct rtc_time * time)18 int rtc_get(struct rtc_time *time)
19 {
20 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
21 uint32_t day, hour, min, sec;
22
23 day = readl(&rtc_regs->dayr);
24 hour = readl(&rtc_regs->hourmin);
25 sec = readl(&rtc_regs->seconds);
26
27 min = (hour >> MIN_SHIFT) & MIN_MASK;
28 hour = (hour >> HOUR_SHIFT) & HOUR_MASK;
29
30 sec += min * 60 + hour * 3600 + day * 24 * 3600;
31
32 rtc_to_tm(sec, time);
33
34 return 0;
35 }
36
rtc_set(struct rtc_time * time)37 int rtc_set(struct rtc_time *time)
38 {
39 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
40 uint32_t day, hour, min, sec;
41
42 sec = rtc_mktime(time);
43
44 day = sec / (24 * 3600);
45 sec = sec % (24 * 3600);
46 hour = sec / 3600;
47 sec = sec % 3600;
48 min = sec / 60;
49 sec = sec % 60;
50
51 hour = (hour & HOUR_MASK) << HOUR_SHIFT;
52 hour |= (min & MIN_MASK) << MIN_SHIFT;
53
54 writel(day, &rtc_regs->dayr);
55 writel(hour, &rtc_regs->hourmin);
56 writel(sec, &rtc_regs->seconds);
57
58 return 0;
59 }
60
rtc_reset(void)61 void rtc_reset(void)
62 {
63 /* nothing to do */
64 }
65