blob: 7738a7acaa0c79054d67a835945fdf30a5810cef [file] [log] [blame]
Po-Yu Chuang39ba7742009-11-11 17:26:00 +08001/*
2 * Faraday FTRTC010 Real Time Clock
3 *
4 * (C) Copyright 2009 Faraday Technology
5 * Po-Yu Chuang <ratbert@faraday-tech.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22#include <config.h>
23#include <common.h>
24#include <rtc.h>
25#include <asm/io.h>
26
27struct ftrtc010 {
28 unsigned int sec; /* 0x00 */
29 unsigned int min; /* 0x04 */
30 unsigned int hour; /* 0x08 */
31 unsigned int day; /* 0x0c */
32 unsigned int alarm_sec; /* 0x10 */
33 unsigned int alarm_min; /* 0x14 */
34 unsigned int alarm_hour; /* 0x18 */
35 unsigned int record; /* 0x1c */
36 unsigned int cr; /* 0x20 */
37};
38
39/*
40 * RTC Control Register
41 */
42#define FTRTC010_CR_ENABLE (1 << 0)
43#define FTRTC010_CR_INTERRUPT_SEC (1 << 1) /* per second irq */
44#define FTRTC010_CR_INTERRUPT_MIN (1 << 2) /* per minute irq */
45#define FTRTC010_CR_INTERRUPT_HR (1 << 3) /* per hour irq */
46#define FTRTC010_CR_INTERRUPT_DAY (1 << 4) /* per day irq */
47
48static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
49
50static void ftrtc010_enable(void)
51{
52 writel(FTRTC010_CR_ENABLE, &rtc->cr);
53}
54
55/*
56 * return current time in seconds
57 */
58static unsigned long ftrtc010_time(void)
59{
60 unsigned long day;
61 unsigned long hour;
62 unsigned long minute;
63 unsigned long second;
64 unsigned long second2;
65
66 do {
67 second = readl(&rtc->sec);
68 day = readl(&rtc->day);
69 hour = readl(&rtc->hour);
70 minute = readl(&rtc->min);
71 second2 = readl(&rtc->sec);
72 } while (second != second2);
73
74 return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
75}
76
77/*
78 * Get the current time from the RTC
79 */
80
81int rtc_get(struct rtc_time *tmp)
82{
83 unsigned long now;
84
85 debug("%s(): record register: %x\n",
86 __func__, readl(&rtc->record));
87
88 now = ftrtc010_time() + readl(&rtc->record);
89
90 to_tm(now, tmp);
91
92 return 0;
93}
94
95/*
96 * Set the RTC
97 */
98int rtc_set(struct rtc_time *tmp)
99{
100 unsigned long new;
101 unsigned long now;
102
103 debug("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
104 __func__,
105 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
106 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
107
108 new = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour,
109 tmp->tm_min, tmp->tm_sec);
110
111 now = ftrtc010_time();
112
113 debug("%s(): write %lx to record register\n", __func__, new - now);
114
115 writel(new - now, &rtc->record);
116
117 return 0;
118}
119
120void rtc_reset(void)
121{
122 debug("%s()\n", __func__);
123 ftrtc010_enable();
124}