summaryrefslogtreecommitdiffstats
path: root/drivers/rtc/ftrtc010.c
blob: 25e4a7bcdb8222cb58e457283296176533bb0f79 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
 * Faraday FTRTC010 Real Time Clock
 *
 * (C) Copyright 2009 Faraday Technology
 * Po-Yu Chuang <ratbert@faraday-tech.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <config.h>
#include <common.h>
#include <rtc.h>
#include <asm/io.h>

struct ftrtc010 {
	unsigned int sec;		/* 0x00 */
	unsigned int min;		/* 0x04 */
	unsigned int hour;		/* 0x08 */
	unsigned int day;		/* 0x0c */
	unsigned int alarm_sec;		/* 0x10 */
	unsigned int alarm_min;		/* 0x14 */
	unsigned int alarm_hour;	/* 0x18 */
	unsigned int record;		/* 0x1c */
	unsigned int cr;		/* 0x20 */
	unsigned int wsec;		/* 0x24 */
	unsigned int wmin;		/* 0x28 */
	unsigned int whour;		/* 0x2c */
	unsigned int wday;		/* 0x30 */
	unsigned int intr;		/* 0x34 */
	unsigned int div;		/* 0x38 */
	unsigned int rev;		/* 0x3c */
};

/*
 * RTC Control Register
 */
#define FTRTC010_CR_ENABLE		(1 << 0)
#define FTRTC010_CR_INTERRUPT_SEC	(1 << 1)	/* per second irq */
#define FTRTC010_CR_INTERRUPT_MIN	(1 << 2)	/* per minute irq */
#define FTRTC010_CR_INTERRUPT_HR	(1 << 3)	/* per hour   irq */
#define FTRTC010_CR_INTERRUPT_DAY	(1 << 4)	/* per day    irq */

static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;

static void ftrtc010_enable(void)
{
	writel(FTRTC010_CR_ENABLE, &rtc->cr);
}

/*
 * return current time in seconds
 */
static unsigned long ftrtc010_time(void)
{
	unsigned long day;
	unsigned long hour;
	unsigned long minute;
	unsigned long second;
	unsigned long second2;

	do {
		second	= readl(&rtc->sec);
		day	= readl(&rtc->day);
		hour	= readl(&rtc->hour);
		minute	= readl(&rtc->min);
		second2	= readl(&rtc->sec);
	} while (second != second2);

	return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
}

/*
 * Get the current time from the RTC
 */

int rtc_get(struct rtc_time *tmp)
{
	unsigned long now;

	debug("%s(): record register: %x\n",
	      __func__, readl(&rtc->record));

#ifdef CONFIG_FTRTC010_PCLK
	now = (ftrtc010_time() + readl(&rtc->record)) / RTC_DIV_COUNT;
#else /* CONFIG_FTRTC010_EXTCLK */
	now = ftrtc010_time() + readl(&rtc->record);
#endif

	to_tm(now, tmp);

	return 0;
}

/*
 * Set the RTC
 */
int rtc_set(struct rtc_time *tmp)
{
	unsigned long new;
	unsigned long now;

	debug("%s(): DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
	      __func__,
	      tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	      tmp->tm_hour, tmp->tm_min, tmp->tm_sec);

	new = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour,
		     tmp->tm_min, tmp->tm_sec);

	now = ftrtc010_time();

	debug("%s(): write %lx to record register\n", __func__, new - now);

	writel(new - now, &rtc->record);

	return 0;
}

void rtc_reset(void)
{
	debug("%s()\n", __func__);
	ftrtc010_enable();
}
OpenPOWER on IntegriCloud