2 * Faraday FTRTC010 Real Time Clock
4 * (C) Copyright 2009 Faraday Technology
5 * Po-Yu Chuang <ratbert@faraday-tech.com>
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.
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.
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.
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 */
40 * RTC Control Register
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 */
48 static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
50 static void ftrtc010_enable (void)
52 writel (FTRTC010_CR_ENABLE, &rtc->cr);
56 * return current time in seconds
58 static unsigned long ftrtc010_time (void)
64 unsigned long second2;
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);
74 return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
78 * Get the current time from the RTC
81 int rtc_get (struct rtc_time *tmp)
85 debug ("%s(): record register: %x\n",
86 __func__, readl (&rtc->record));
88 now = ftrtc010_time () + readl (&rtc->record);
98 int rtc_set (struct rtc_time *tmp)
103 debug ("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
105 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
106 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
108 new = mktime (tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour,
109 tmp->tm_min, tmp->tm_sec);
111 now = ftrtc010_time ();
113 debug ("%s(): write %lx to record register\n", __func__, new - now);
115 writel (new - now, &rtc->record);
120 void rtc_reset (void)
122 debug ("%s()\n", __func__);