1 /* 2 * (C) Copyright 2003 3 * David Müller ELSOFT AG Switzerland. d.mueller@elsoft.ch 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * Date & Time support for the built-in Samsung S3C24X0 RTC 10 */ 11 12 #include <common.h> 13 #include <command.h> 14 15 #if (defined(CONFIG_CMD_DATE)) 16 17 #include <asm/arch/s3c24x0_cpu.h> 18 19 #include <rtc.h> 20 #include <asm/io.h> 21 #include <linux/compiler.h> 22 23 typedef enum { 24 RTC_ENABLE, 25 RTC_DISABLE 26 } RTC_ACCESS; 27 28 29 static inline void SetRTC_Access(RTC_ACCESS a) 30 { 31 struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); 32 33 switch (a) { 34 case RTC_ENABLE: 35 writeb(readb(&rtc->rtccon) | 0x01, &rtc->rtccon); 36 break; 37 38 case RTC_DISABLE: 39 writeb(readb(&rtc->rtccon) & ~0x01, &rtc->rtccon); 40 break; 41 } 42 } 43 44 /* ------------------------------------------------------------------------- */ 45 46 int rtc_get(struct rtc_time *tmp) 47 { 48 struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); 49 uchar sec, min, hour, mday, wday, mon, year; 50 __maybe_unused uchar a_sec, a_min, a_hour, a_date, 51 a_mon, a_year, a_armed; 52 53 /* enable access to RTC registers */ 54 SetRTC_Access(RTC_ENABLE); 55 56 /* read RTC registers */ 57 do { 58 sec = readb(&rtc->bcdsec); 59 min = readb(&rtc->bcdmin); 60 hour = readb(&rtc->bcdhour); 61 mday = readb(&rtc->bcddate); 62 wday = readb(&rtc->bcdday); 63 mon = readb(&rtc->bcdmon); 64 year = readb(&rtc->bcdyear); 65 } while (sec != readb(&rtc->bcdsec)); 66 67 /* read ALARM registers */ 68 a_sec = readb(&rtc->almsec); 69 a_min = readb(&rtc->almmin); 70 a_hour = readb(&rtc->almhour); 71 a_date = readb(&rtc->almdate); 72 a_mon = readb(&rtc->almmon); 73 a_year = readb(&rtc->almyear); 74 a_armed = readb(&rtc->rtcalm); 75 76 /* disable access to RTC registers */ 77 SetRTC_Access(RTC_DISABLE); 78 79 #ifdef RTC_DEBUG 80 printf("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 81 "hr: %02x min: %02x sec: %02x\n", 82 year, mon, mday, wday, hour, min, sec); 83 printf("Alarms: %02x: year: %02x month: %02x date: %02x hour: " 84 "%02x min: %02x sec: %02x\n", 85 a_armed, a_year, a_mon, a_date, a_hour, a_min, a_sec); 86 #endif 87 88 tmp->tm_sec = bcd2bin(sec & 0x7F); 89 tmp->tm_min = bcd2bin(min & 0x7F); 90 tmp->tm_hour = bcd2bin(hour & 0x3F); 91 tmp->tm_mday = bcd2bin(mday & 0x3F); 92 tmp->tm_mon = bcd2bin(mon & 0x1F); 93 tmp->tm_year = bcd2bin(year); 94 tmp->tm_wday = bcd2bin(wday & 0x07); 95 if (tmp->tm_year < 70) 96 tmp->tm_year += 2000; 97 else 98 tmp->tm_year += 1900; 99 tmp->tm_yday = 0; 100 tmp->tm_isdst = 0; 101 #ifdef RTC_DEBUG 102 printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 103 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 104 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 105 #endif 106 107 return 0; 108 } 109 110 int rtc_set(struct rtc_time *tmp) 111 { 112 struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); 113 uchar sec, min, hour, mday, wday, mon, year; 114 115 #ifdef RTC_DEBUG 116 printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 117 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 118 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 119 #endif 120 year = bin2bcd(tmp->tm_year % 100); 121 mon = bin2bcd(tmp->tm_mon); 122 wday = bin2bcd(tmp->tm_wday); 123 mday = bin2bcd(tmp->tm_mday); 124 hour = bin2bcd(tmp->tm_hour); 125 min = bin2bcd(tmp->tm_min); 126 sec = bin2bcd(tmp->tm_sec); 127 128 /* enable access to RTC registers */ 129 SetRTC_Access(RTC_ENABLE); 130 131 /* write RTC registers */ 132 writeb(sec, &rtc->bcdsec); 133 writeb(min, &rtc->bcdmin); 134 writeb(hour, &rtc->bcdhour); 135 writeb(mday, &rtc->bcddate); 136 writeb(wday, &rtc->bcdday); 137 writeb(mon, &rtc->bcdmon); 138 writeb(year, &rtc->bcdyear); 139 140 /* disable access to RTC registers */ 141 SetRTC_Access(RTC_DISABLE); 142 143 return 0; 144 } 145 146 void rtc_reset(void) 147 { 148 struct s3c24x0_rtc *rtc = s3c24x0_get_base_rtc(); 149 150 writeb((readb(&rtc->rtccon) & ~0x06) | 0x08, &rtc->rtccon); 151 writeb(readb(&rtc->rtccon) & ~(0x08 | 0x01), &rtc->rtccon); 152 } 153 154 #endif 155