1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> 4 * Andreas Heppel <aheppel@sysgo.de> 5 */ 6 7 /* 8 * Date & Time support for the MK48T59 RTC 9 */ 10 11 #undef RTC_DEBUG 12 13 #include <common.h> 14 #include <command.h> 15 #include <config.h> 16 #include <rtc.h> 17 #include <mk48t59.h> 18 19 #if defined(CONFIG_BAB7xx) 20 21 static uchar rtc_read (short reg) 22 { 23 out8(RTC_PORT_ADDR0, reg & 0xFF); 24 out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF); 25 return in8(RTC_PORT_DATA); 26 } 27 28 static void rtc_write (short reg, uchar val) 29 { 30 out8(RTC_PORT_ADDR0, reg & 0xFF); 31 out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF); 32 out8(RTC_PORT_DATA, val); 33 } 34 35 #elif defined(CONFIG_EVAL5200) 36 37 static uchar rtc_read (short reg) 38 { 39 return in8(RTC(reg)); 40 } 41 42 static void rtc_write (short reg, uchar val) 43 { 44 out8(RTC(reg),val); 45 } 46 47 #else 48 # error Board specific rtc access functions should be supplied 49 #endif 50 51 /* ------------------------------------------------------------------------- */ 52 53 void *nvram_read(void *dest, const short src, size_t count) 54 { 55 uchar *d = (uchar *) dest; 56 short s = src; 57 58 while (count--) 59 *d++ = rtc_read(s++); 60 61 return dest; 62 } 63 64 void nvram_write(short dest, const void *src, size_t count) 65 { 66 short d = dest; 67 uchar *s = (uchar *) src; 68 69 while (count--) 70 rtc_write(d++, *s++); 71 } 72 73 /* ------------------------------------------------------------------------- */ 74 75 int rtc_get (struct rtc_time *tmp) 76 { 77 uchar save_ctrl_a; 78 uchar sec, min, hour, mday, wday, mon, year; 79 80 /* Simple: freeze the clock, read it and allow updates again */ 81 save_ctrl_a = rtc_read(RTC_CONTROLA); 82 83 /* Set the register to read the value. */ 84 save_ctrl_a |= RTC_CA_READ; 85 rtc_write(RTC_CONTROLA, save_ctrl_a); 86 87 sec = rtc_read (RTC_SECONDS); 88 min = rtc_read (RTC_MINUTES); 89 hour = rtc_read (RTC_HOURS); 90 mday = rtc_read (RTC_DAY_OF_MONTH); 91 wday = rtc_read (RTC_DAY_OF_WEEK); 92 mon = rtc_read (RTC_MONTH); 93 year = rtc_read (RTC_YEAR); 94 95 /* re-enable update */ 96 save_ctrl_a &= ~RTC_CA_READ; 97 rtc_write(RTC_CONTROLA, save_ctrl_a); 98 99 #ifdef RTC_DEBUG 100 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " 101 "hr: %02x min: %02x sec: %02x\n", 102 year, mon, mday, wday, 103 hour, min, sec ); 104 #endif 105 tmp->tm_sec = bcd2bin (sec & 0x7F); 106 tmp->tm_min = bcd2bin (min & 0x7F); 107 tmp->tm_hour = bcd2bin (hour & 0x3F); 108 tmp->tm_mday = bcd2bin (mday & 0x3F); 109 tmp->tm_mon = bcd2bin (mon & 0x1F); 110 tmp->tm_year = bcd2bin (year); 111 tmp->tm_wday = bcd2bin (wday & 0x07); 112 if(tmp->tm_year<70) 113 tmp->tm_year+=2000; 114 else 115 tmp->tm_year+=1900; 116 tmp->tm_yday = 0; 117 tmp->tm_isdst= 0; 118 #ifdef RTC_DEBUG 119 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 120 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 121 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 122 #endif 123 124 return 0; 125 } 126 127 int rtc_set (struct rtc_time *tmp) 128 { 129 uchar save_ctrl_a; 130 131 #ifdef RTC_DEBUG 132 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 133 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 134 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 135 #endif 136 save_ctrl_a = rtc_read(RTC_CONTROLA); 137 138 save_ctrl_a |= RTC_CA_WRITE; 139 rtc_write(RTC_CONTROLA, save_ctrl_a); /* disables the RTC to update the regs */ 140 141 rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100)); 142 rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon)); 143 144 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)); 145 rtc_write (RTC_DAY_OF_MONTH, bin2bcd(tmp->tm_mday)); 146 rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour)); 147 rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min )); 148 rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec )); 149 150 save_ctrl_a &= ~RTC_CA_WRITE; 151 rtc_write(RTC_CONTROLA, save_ctrl_a); /* enables the RTC to update the regs */ 152 153 return 0; 154 } 155 156 void rtc_reset (void) 157 { 158 uchar control_b; 159 160 /* 161 * Start oscillator here. 162 */ 163 control_b = rtc_read(RTC_CONTROLB); 164 165 control_b &= ~RTC_CB_STOP; 166 rtc_write(RTC_CONTROLB, control_b); 167 } 168 169 void rtc_set_watchdog(short multi, short res) 170 { 171 uchar wd_value; 172 173 wd_value = RTC_WDS | ((multi & 0x1F) << 2) | (res & 0x3); 174 rtc_write(RTC_WATCHDOG, wd_value); 175 } 176