1 /* 2 * Faraday FTRTC010 Real Time Clock 3 * 4 * (C) Copyright 2009 Faraday Technology 5 * Po-Yu Chuang <ratbert@faraday-tech.com> 6 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <config.h> 11 #include <common.h> 12 #include <rtc.h> 13 #include <asm/io.h> 14 15 struct ftrtc010 { 16 unsigned int sec; /* 0x00 */ 17 unsigned int min; /* 0x04 */ 18 unsigned int hour; /* 0x08 */ 19 unsigned int day; /* 0x0c */ 20 unsigned int alarm_sec; /* 0x10 */ 21 unsigned int alarm_min; /* 0x14 */ 22 unsigned int alarm_hour; /* 0x18 */ 23 unsigned int record; /* 0x1c */ 24 unsigned int cr; /* 0x20 */ 25 unsigned int wsec; /* 0x24 */ 26 unsigned int wmin; /* 0x28 */ 27 unsigned int whour; /* 0x2c */ 28 unsigned int wday; /* 0x30 */ 29 unsigned int intr; /* 0x34 */ 30 unsigned int div; /* 0x38 */ 31 unsigned int rev; /* 0x3c */ 32 }; 33 34 /* 35 * RTC Control Register 36 */ 37 #define FTRTC010_CR_ENABLE (1 << 0) 38 #define FTRTC010_CR_INTERRUPT_SEC (1 << 1) /* per second irq */ 39 #define FTRTC010_CR_INTERRUPT_MIN (1 << 2) /* per minute irq */ 40 #define FTRTC010_CR_INTERRUPT_HR (1 << 3) /* per hour irq */ 41 #define FTRTC010_CR_INTERRUPT_DAY (1 << 4) /* per day irq */ 42 43 static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE; 44 45 static void ftrtc010_enable(void) 46 { 47 writel(FTRTC010_CR_ENABLE, &rtc->cr); 48 } 49 50 /* 51 * return current time in seconds 52 */ 53 static unsigned long ftrtc010_time(void) 54 { 55 unsigned long day; 56 unsigned long hour; 57 unsigned long minute; 58 unsigned long second; 59 unsigned long second2; 60 61 do { 62 second = readl(&rtc->sec); 63 day = readl(&rtc->day); 64 hour = readl(&rtc->hour); 65 minute = readl(&rtc->min); 66 second2 = readl(&rtc->sec); 67 } while (second != second2); 68 69 return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second; 70 } 71 72 /* 73 * Get the current time from the RTC 74 */ 75 76 int rtc_get(struct rtc_time *tmp) 77 { 78 unsigned long now; 79 80 debug("%s(): record register: %x\n", 81 __func__, readl(&rtc->record)); 82 83 #ifdef CONFIG_FTRTC010_PCLK 84 now = (ftrtc010_time() + readl(&rtc->record)) / RTC_DIV_COUNT; 85 #else /* CONFIG_FTRTC010_EXTCLK */ 86 now = ftrtc010_time() + readl(&rtc->record); 87 #endif 88 89 to_tm(now, tmp); 90 91 return 0; 92 } 93 94 /* 95 * Set the RTC 96 */ 97 int rtc_set(struct rtc_time *tmp) 98 { 99 unsigned long new; 100 unsigned long now; 101 102 debug("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 103 __func__, 104 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 105 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 106 107 new = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour, 108 tmp->tm_min, tmp->tm_sec); 109 110 now = ftrtc010_time(); 111 112 debug("%s(): write %lx to record register\n", __func__, new - now); 113 114 writel(new - now, &rtc->record); 115 116 return 0; 117 } 118 119 void rtc_reset(void) 120 { 121 debug("%s()\n", __func__); 122 ftrtc010_enable(); 123 } 124