1 /* 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 27 struct 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 48 static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE; 49 50 static void ftrtc010_enable(void) 51 { 52 writel(FTRTC010_CR_ENABLE, &rtc->cr); 53 } 54 55 /* 56 * return current time in seconds 57 */ 58 static 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 81 int 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 */ 98 int 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 } 119 120 void rtc_reset(void) 121 { 122 debug("%s()\n", __func__); 123 ftrtc010_enable(); 124 } 125