summaryrefslogtreecommitdiff
path: root/src/drivers/ams/as3722rtc.c
blob: 6a1ca949d4e02b4f2db9231fc09d15c586563afc (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
/*
 * This file is part of the coreboot project.
 *
 * Copyright 2014 The Chromium OS Authors. All rights reserved.
 *
 * 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; version 2 of the License.
 *
 * 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.
 */

#include <bcd.h>
#include <console/console.h>
#include <device/i2c.h>
#include <rtc.h>
#include <stdint.h>

enum AS3722_RTC_REG
{
	AS3722_RTC_CONTROL = 0x60,
	AS3722_RTC_SECOND = 0x61,
	AS3722_RTC_MINUTE = 0x62,
	AS3722_RTC_HOUR = 0x63,
	AS3722_RTC_DAY = 0x64,
	AS3722_RTC_MONTH = 0x65,
	AS3722_RTC_YEAR = 0x66
};

enum {
	AS3722_RTC_CONTROL_ON = 0x1 << 2
};

static uint8_t as3722_read(enum AS3722_RTC_REG reg)
{
	uint8_t val;
	i2c_readb(CONFIG_DRIVERS_AS3722_RTC_BUS,
		  CONFIG_DRIVERS_AS3722_RTC_ADDR, reg, &val);
	return val;
}

static void as3722_write(enum AS3722_RTC_REG reg, uint8_t val)
{
	i2c_writeb(CONFIG_DRIVERS_AS3722_RTC_BUS,
		   CONFIG_DRIVERS_AS3722_RTC_ADDR, reg, val);
}

static void as3722rtc_init(void)
{
	static int initialized;
	if (initialized)
		return;

	uint8_t control = as3722_read(AS3722_RTC_CONTROL);
	as3722_write(AS3722_RTC_CONTROL, control | AS3722_RTC_CONTROL_ON);

	initialized = 1;
}

int rtc_set(const struct rtc_time *time)
{
	as3722rtc_init();

	as3722_write(AS3722_RTC_SECOND, bin2bcd(time->sec));
	as3722_write(AS3722_RTC_MINUTE, bin2bcd(time->min));
	as3722_write(AS3722_RTC_HOUR, bin2bcd(time->hour));
	as3722_write(AS3722_RTC_DAY, bin2bcd(time->mday));
	as3722_write(AS3722_RTC_MONTH, bin2bcd(time->mon));
	as3722_write(AS3722_RTC_YEAR, bin2bcd(time->year));
	return 0;
}

int rtc_get(struct rtc_time *time)
{
	as3722rtc_init();

	time->sec = bcd2bin(as3722_read(AS3722_RTC_SECOND) & 0x7f);
	time->min = bcd2bin(as3722_read(AS3722_RTC_MINUTE) & 0x7f);
	time->hour = bcd2bin(as3722_read(AS3722_RTC_HOUR) & 0x3f);
	time->mday = bcd2bin(as3722_read(AS3722_RTC_DAY) & 0x3f);
	time->mon = bcd2bin(as3722_read(AS3722_RTC_MONTH) & 0x1f);
	time->year = bcd2bin(as3722_read(AS3722_RTC_YEAR) & 0x7f);
	return 0;
}