1 /* 2 * Copyright (C) 2011 3 * Jason Cooper <u-boot@lakedaemon.net> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * Date & Time support for Marvell Integrated RTC 10 */ 11 12 #include <common.h> 13 #include <command.h> 14 #include <rtc.h> 15 #include <asm/io.h> 16 #include "mvrtc.h" 17 18 /* This RTC does not support century, so we assume 20 */ 19 #define CENTURY 20 20 21 int rtc_get(struct rtc_time *t) 22 { 23 u32 time; 24 u32 date; 25 struct mvrtc_registers *mvrtc_regs; 26 27 mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE; 28 29 /* read the time register */ 30 time = readl(&mvrtc_regs->time); 31 32 /* read the date register */ 33 date = readl(&mvrtc_regs->date); 34 35 /* test for 12 hour clock (can't tell if it's am/pm) */ 36 if (time & MVRTC_HRFMT_MSK) { 37 printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n"); 38 return -1; 39 } 40 41 /* time */ 42 t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); 43 t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK); 44 t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK); 45 t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK); 46 t->tm_wday--; 47 48 /* date */ 49 t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK); 50 t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK); 51 t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK); 52 t->tm_year += CENTURY * 100; 53 54 /* not supported in this RTC */ 55 t->tm_yday = 0; 56 t->tm_isdst = 0; 57 58 return 0; 59 } 60 61 int rtc_set(struct rtc_time *t) 62 { 63 u32 time = 0; /* sets hour format bit to zero, 24hr format. */ 64 u32 date = 0; 65 struct mvrtc_registers *mvrtc_regs; 66 67 mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE; 68 69 /* check that this code isn't 80+ years old ;-) */ 70 if ((t->tm_year / 100) != CENTURY) 71 printf("Warning: Only century %d supported.\n", CENTURY); 72 73 /* time */ 74 time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT; 75 time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT; 76 time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT; 77 time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT; 78 79 /* date */ 80 date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT; 81 date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT; 82 date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT; 83 84 /* write the time register */ 85 writel(time, &mvrtc_regs->time); 86 87 /* write the date register */ 88 writel(date, &mvrtc_regs->date); 89 90 return 0; 91 } 92 93 void rtc_reset(void) 94 { 95 u32 time; 96 u32 sec; 97 struct mvrtc_registers *mvrtc_regs; 98 99 mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE; 100 101 /* no init routine for this RTC needed, just check that it's working */ 102 time = readl(&mvrtc_regs->time); 103 sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); 104 udelay(1000000); 105 time = readl(&mvrtc_regs->time); 106 107 if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK)) 108 printf("Error: RTC did not increment.\n"); 109 } 110