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 <dm.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 static int __mv_rtc_get(struct mvrtc_registers *regs, struct rtc_time *t) 22 { 23 u32 time; 24 u32 date; 25 26 /* read the time register */ 27 time = readl(®s->time); 28 29 /* read the date register */ 30 date = readl(®s->date); 31 32 /* test for 12 hour clock (can't tell if it's am/pm) */ 33 if (time & MVRTC_HRFMT_MSK) { 34 printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n"); 35 return -1; 36 } 37 38 /* time */ 39 t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); 40 t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK); 41 t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK); 42 t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK); 43 t->tm_wday--; 44 45 /* date */ 46 t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK); 47 t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK); 48 t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK); 49 t->tm_year += CENTURY * 100; 50 51 /* not supported in this RTC */ 52 t->tm_yday = 0; 53 t->tm_isdst = 0; 54 55 return 0; 56 } 57 58 #ifndef CONFIG_DM_RTC 59 int rtc_get(struct rtc_time *t) 60 { 61 struct mvrtc_registers *regs; 62 63 regs = (struct mvrtc_registers *)KW_RTC_BASE; 64 return __mv_rtc_get(regs, t); 65 } 66 #endif /* !CONFIG_DM_RTC */ 67 68 static int __mv_rtc_set(struct mvrtc_registers *regs, const struct rtc_time *t) 69 { 70 u32 time = 0; /* sets hour format bit to zero, 24hr format. */ 71 u32 date = 0; 72 73 /* check that this code isn't 80+ years old ;-) */ 74 if ((t->tm_year / 100) != CENTURY) 75 printf("Warning: Only century %d supported.\n", CENTURY); 76 77 /* time */ 78 time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT; 79 time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT; 80 time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT; 81 time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT; 82 83 /* date */ 84 date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT; 85 date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT; 86 date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT; 87 88 /* write the time register */ 89 writel(time, ®s->time); 90 91 /* write the date register */ 92 writel(date, ®s->date); 93 94 return 0; 95 } 96 97 #ifndef CONFIG_DM_RTC 98 int rtc_set(struct rtc_time *t) 99 { 100 struct mvrtc_registers *regs; 101 102 regs = (struct mvrtc_registers *)KW_RTC_BASE; 103 return __mv_rtc_set(regs, t); 104 } 105 #endif /* !CONFIG_DM_RTC */ 106 107 static void __mv_rtc_reset(struct mvrtc_registers *regs) 108 { 109 u32 time; 110 u32 sec; 111 112 /* no init routine for this RTC needed, just check that it's working */ 113 time = readl(®s->time); 114 sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); 115 udelay(1000000); 116 time = readl(®s->time); 117 118 if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK)) 119 printf("Error: RTC did not increment.\n"); 120 } 121 122 #ifndef CONFIG_DM_RTC 123 void rtc_reset(void) 124 { 125 struct mvrtc_registers *regs; 126 127 regs = (struct mvrtc_registers *)KW_RTC_BASE; 128 __mv_rtc_reset(regs); 129 } 130 #endif /* !CONFIG_DM_RTC */ 131 132 #ifdef CONFIG_DM_RTC 133 static int mv_rtc_get(struct udevice *dev, struct rtc_time *tm) 134 { 135 struct mvrtc_pdata *pdata = dev_get_platdata(dev); 136 struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase; 137 138 return __mv_rtc_get(regs, tm); 139 } 140 141 static int mv_rtc_set(struct udevice *dev, const struct rtc_time *tm) 142 { 143 struct mvrtc_pdata *pdata = dev_get_platdata(dev); 144 struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase; 145 146 return __mv_rtc_set(regs, tm); 147 } 148 149 static int mv_rtc_reset(struct udevice *dev) 150 { 151 struct mvrtc_pdata *pdata = dev_get_platdata(dev); 152 struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase; 153 154 __mv_rtc_reset(regs); 155 return 0; 156 } 157 158 static const struct rtc_ops mv_rtc_ops = { 159 .get = mv_rtc_get, 160 .set = mv_rtc_set, 161 .reset = mv_rtc_reset, 162 }; 163 164 static const struct udevice_id mv_rtc_ids[] = { 165 { .compatible = "marvell,kirkwood-rtc" }, 166 { .compatible = "marvell,orion-rtc" }, 167 { } 168 }; 169 170 static int mv_rtc_ofdata_to_platdata(struct udevice *dev) 171 { 172 struct mvrtc_pdata *pdata = dev_get_platdata(dev); 173 174 pdata->iobase = devfdt_get_addr(dev); 175 return 0; 176 } 177 178 U_BOOT_DRIVER(rtc_mv) = { 179 .name = "rtc-mv", 180 .id = UCLASS_RTC, 181 .ofdata_to_platdata = mv_rtc_ofdata_to_platdata, 182 .of_match = mv_rtc_ids, 183 .ops = &mv_rtc_ops, 184 }; 185 #endif /* CONFIG_DM_RTC */ 186