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