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 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 */ 44 }; 45 46 /* 47 * RTC Control Register 48 */ 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 */ 54 55 static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE; 56 57 static void ftrtc010_enable(void) 58 { 59 writel(FTRTC010_CR_ENABLE, &rtc->cr); 60 } 61 62 /* 63 * return current time in seconds 64 */ 65 static unsigned long ftrtc010_time(void) 66 { 67 unsigned long day; 68 unsigned long hour; 69 unsigned long minute; 70 unsigned long second; 71 unsigned long second2; 72 73 do { 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); 80 81 return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second; 82 } 83 84 /* 85 * Get the current time from the RTC 86 */ 87 88 int rtc_get(struct rtc_time *tmp) 89 { 90 unsigned long now; 91 92 debug("%s(): record register: %x\n", 93 __func__, readl(&rtc->record)); 94 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); 99 #endif 100 101 to_tm(now, tmp); 102 103 return 0; 104 } 105 106 /* 107 * Set the RTC 108 */ 109 int rtc_set(struct rtc_time *tmp) 110 { 111 unsigned long new; 112 unsigned long now; 113 114 debug("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 115 __func__, 116 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 117 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 118 119 new = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour, 120 tmp->tm_min, tmp->tm_sec); 121 122 now = ftrtc010_time(); 123 124 debug("%s(): write %lx to record register\n", __func__, new - now); 125 126 writel(new - now, &rtc->record); 127 128 return 0; 129 } 130 131 void rtc_reset(void) 132 { 133 debug("%s()\n", __func__); 134 ftrtc010_enable(); 135 } 136