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rtc: adding RX8010SJ rtc driver
[people/ms/u-boot.git] / drivers / rtc / mx27rtc.c
1 /*
2 * Freescale i.MX27 RTC Driver
3 *
4 * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
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
19 int 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 rtc_to_tm(sec, time);
34
35 return 0;
36 }
37
38 int 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 = rtc_mktime(time);
44
45 day = sec / (24 * 3600);
46 sec = sec % (24 * 3600);
47 hour = sec / 3600;
48 sec = sec % 3600;
49 min = sec / 60;
50 sec = sec % 60;
51
52 hour = (hour & HOUR_MASK) << HOUR_SHIFT;
53 hour |= (min & MIN_MASK) << MIN_SHIFT;
54
55 writel(day, &rtc_regs->dayr);
56 writel(hour, &rtc_regs->hourmin);
57 writel(sec, &rtc_regs->seconds);
58
59 return 0;
60 }
61
62 void rtc_reset(void)
63 {
64 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
65
66 writel(0, &rtc_regs->dayr);
67 writel(0, &rtc_regs->hourmin);
68 writel(0, &rtc_regs->seconds);
69 }