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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | /* * (C) Copyright 2004 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * Date & Time support for MAXIM MAX6900 RTC */ /* #define DEBUG */ #include <common.h> #include <command.h> #include <rtc.h> #include <i2c.h> #if defined(CONFIG_RTC_MAX6900) && defined(CONFIG_CMD_DATE) #ifndef CFG_I2C_RTC_ADDR #define CFG_I2C_RTC_ADDR 0x50 #endif /* ------------------------------------------------------------------------- */ static uchar rtc_read (uchar reg) { return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg)); } static void rtc_write (uchar reg, uchar val) { i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val); udelay(2500); } static unsigned bcd2bin (uchar n) { return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); } static unsigned char bin2bcd (unsigned int n) { return (((n / 10) << 4) | (n % 10)); } /* ------------------------------------------------------------------------- */ void rtc_get (struct rtc_time *tmp) { uchar sec, min, hour, mday, wday, mon, cent, year; int retry = 1; do { sec = rtc_read (0x80); min = rtc_read (0x82); hour = rtc_read (0x84); mday = rtc_read (0x86); mon = rtc_read (0x88); wday = rtc_read (0x8a); year = rtc_read (0x8c); cent = rtc_read (0x92); /* * Check for seconds rollover */ if ((sec != 59) || (rtc_read(0x80) == sec)){ retry = 0; } } while (retry); debug ( "Get RTC year: %02x mon: %02x cent: %02x mday: %02x wday: %02x " "hr: %02x min: %02x sec: %02x\n", year, mon, cent, mday, wday, hour, min, sec ); tmp->tm_sec = bcd2bin (sec & 0x7F); tmp->tm_min = bcd2bin (min & 0x7F); tmp->tm_hour = bcd2bin (hour & 0x3F); tmp->tm_mday = bcd2bin (mday & 0x3F); tmp->tm_mon = bcd2bin (mon & 0x1F); tmp->tm_year = bcd2bin (year) + bcd2bin(cent) * 100; tmp->tm_wday = bcd2bin (wday & 0x07); tmp->tm_yday = 0; tmp->tm_isdst= 0; debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); } void rtc_set (struct rtc_time *tmp) { debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); rtc_write (0x9E, 0x00); rtc_write (0x80, 0); /* Clear seconds to ensure no rollover */ rtc_write (0x92, bin2bcd(tmp->tm_year / 100)); rtc_write (0x8c, bin2bcd(tmp->tm_year % 100)); rtc_write (0x8a, bin2bcd(tmp->tm_wday)); rtc_write (0x88, bin2bcd(tmp->tm_mon)); rtc_write (0x86, bin2bcd(tmp->tm_mday)); rtc_write (0x84, bin2bcd(tmp->tm_hour)); rtc_write (0x82, bin2bcd(tmp->tm_min )); rtc_write (0x80, bin2bcd(tmp->tm_sec )); } void rtc_reset (void) { } #endif |