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 */
37 unsigned int wsec; /* 0x24 */
38 unsigned int wmin; /* 0x28 */
39 unsigned int whour; /* 0x2c */
40 unsigned int wday; /* 0x30 */
41 unsigned int intr; /* 0x34 */
42 unsigned int div; /* 0x38 */
43 unsigned int rev; /* 0x3c */
47 * RTC Control Register
49 #define FTRTC010_CR_ENABLE (1 << 0)
50 #define FTRTC010_CR_INTERRUPT_SEC (1 << 1) /* per second irq */
51 #define FTRTC010_CR_INTERRUPT_MIN (1 << 2) /* per minute irq */
52 #define FTRTC010_CR_INTERRUPT_HR (1 << 3) /* per hour irq */
53 #define FTRTC010_CR_INTERRUPT_DAY (1 << 4) /* per day irq */
55 static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
57 static void ftrtc010_enable(void)
59 writel(FTRTC010_CR_ENABLE, &rtc->cr);
63 * return current time in seconds
65 static unsigned long ftrtc010_time(void)
71 unsigned long second2;
74 second = readl(&rtc->sec);
75 day = readl(&rtc->day);
76 hour = readl(&rtc->hour);
77 minute = readl(&rtc->min);
78 second2 = readl(&rtc->sec);
79 } while (second != second2);
81 return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
85 * Get the current time from the RTC
88 int rtc_get(struct rtc_time *tmp)
92 debug("%s(): record register: %x\n",
93 __func__, readl(&rtc->record));
95 #ifdef CONFIG_FTRTC010_PCLK
96 now = (ftrtc010_time() + readl(&rtc->record)) / RTC_DIV_COUNT;
97 #else /* CONFIG_FTRTC010_EXTCLK */
98 now = ftrtc010_time() + readl(&rtc->record);
109 int rtc_set(struct rtc_time *tmp)
114 debug("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
116 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
117 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
119 new = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour,
120 tmp->tm_min, tmp->tm_sec);
122 now = ftrtc010_time();
124 debug("%s(): write %lx to record register\n", __func__, new - now);
126 writel(new - now, &rtc->record);
133 debug("%s()\n", __func__);