1 /* 2 * Copyright (C) 2011 3 * Jason Cooper <u-boot@lakedaemon.net> 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 /* 25 * Date & Time support for Marvell Integrated RTC 26 */ 27 28 #include <common.h> 29 #include <command.h> 30 #include <rtc.h> 31 #include "mvrtc.h" 32 33 /* This RTC does not support century, so we assume 20 */ 34 #define CENTURY 20 35 36 int rtc_get(struct rtc_time *t) 37 { 38 u32 time; 39 u32 date; 40 struct mvrtc_registers *mvrtc_regs; 41 42 mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE; 43 44 /* read the time register */ 45 time = readl(&mvrtc_regs->time); 46 47 /* read the date register */ 48 date = readl(&mvrtc_regs->date); 49 50 /* test for 12 hour clock (can't tell if it's am/pm) */ 51 if (time & MVRTC_HRFMT_MSK) { 52 printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n"); 53 return -1; 54 } 55 56 /* time */ 57 t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); 58 t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK); 59 t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK); 60 t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK); 61 t->tm_wday--; 62 63 /* date */ 64 t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK); 65 t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK); 66 t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK); 67 t->tm_year += CENTURY * 100; 68 69 /* not supported in this RTC */ 70 t->tm_yday = 0; 71 t->tm_isdst = 0; 72 73 return 0; 74 } 75 76 int rtc_set(struct rtc_time *t) 77 { 78 u32 time = 0; /* sets hour format bit to zero, 24hr format. */ 79 u32 date = 0; 80 struct mvrtc_registers *mvrtc_regs; 81 82 mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE; 83 84 /* check that this code isn't 80+ years old ;-) */ 85 if ((t->tm_year / 100) != CENTURY) 86 printf("Warning: Only century %d supported.\n", CENTURY); 87 88 /* time */ 89 time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT; 90 time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT; 91 time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT; 92 time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT; 93 94 /* date */ 95 date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT; 96 date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT; 97 date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT; 98 99 /* write the time register */ 100 writel(time, &mvrtc_regs->time); 101 102 /* write the date register */ 103 writel(date, &mvrtc_regs->date); 104 105 return 0; 106 } 107 108 void rtc_reset(void) 109 { 110 u32 time; 111 u32 sec; 112 struct mvrtc_registers *mvrtc_regs; 113 114 mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE; 115 116 /* no init routine for this RTC needed, just check that it's working */ 117 time = readl(&mvrtc_regs->time); 118 sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); 119 udelay(1000000); 120 time = readl(&mvrtc_regs->time); 121 122 if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK)) 123 printf("Error: RTC did not increment.\n"); 124 } 125