1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Freescale i.MX27 RTC Driver
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <common.h>
10*4882a593Smuzhiyun #include <rtc.h>
11*4882a593Smuzhiyun #include <asm/io.h>
12*4882a593Smuzhiyun #include <asm/arch/imx-regs.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define HOUR_SHIFT 8
15*4882a593Smuzhiyun #define HOUR_MASK 0x1f
16*4882a593Smuzhiyun #define MIN_SHIFT 0
17*4882a593Smuzhiyun #define MIN_MASK 0x3f
18*4882a593Smuzhiyun
rtc_get(struct rtc_time * time)19*4882a593Smuzhiyun int rtc_get(struct rtc_time *time)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
22*4882a593Smuzhiyun uint32_t day, hour, min, sec;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun day = readl(&rtc_regs->dayr);
25*4882a593Smuzhiyun hour = readl(&rtc_regs->hourmin);
26*4882a593Smuzhiyun sec = readl(&rtc_regs->seconds);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun min = (hour >> MIN_SHIFT) & MIN_MASK;
29*4882a593Smuzhiyun hour = (hour >> HOUR_SHIFT) & HOUR_MASK;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun sec += min * 60 + hour * 3600 + day * 24 * 3600;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun rtc_to_tm(sec, time);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return 0;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
rtc_set(struct rtc_time * time)38*4882a593Smuzhiyun int rtc_set(struct rtc_time *time)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
41*4882a593Smuzhiyun uint32_t day, hour, min, sec;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun sec = rtc_mktime(time);
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun day = sec / (24 * 3600);
46*4882a593Smuzhiyun sec = sec % (24 * 3600);
47*4882a593Smuzhiyun hour = sec / 3600;
48*4882a593Smuzhiyun sec = sec % 3600;
49*4882a593Smuzhiyun min = sec / 60;
50*4882a593Smuzhiyun sec = sec % 60;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun hour = (hour & HOUR_MASK) << HOUR_SHIFT;
53*4882a593Smuzhiyun hour |= (min & MIN_MASK) << MIN_SHIFT;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun writel(day, &rtc_regs->dayr);
56*4882a593Smuzhiyun writel(hour, &rtc_regs->hourmin);
57*4882a593Smuzhiyun writel(sec, &rtc_regs->seconds);
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun return 0;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
rtc_reset(void)62*4882a593Smuzhiyun void rtc_reset(void)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun writel(0, &rtc_regs->dayr);
67*4882a593Smuzhiyun writel(0, &rtc_regs->hourmin);
68*4882a593Smuzhiyun writel(0, &rtc_regs->seconds);
69*4882a593Smuzhiyun }
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