// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2011 * Jason Cooper <u-boot@lakedaemon.net> */ /* * Date & Time support for Marvell Integrated RTC */ #include <common.h> #include <command.h> #include <dm.h> #include <rtc.h> #include <asm/io.h> #include "mvrtc.h" /* This RTC does not support century, so we assume 20 */ #define CENTURY 20 static int __mv_rtc_get(struct mvrtc_registers *regs, struct rtc_time *t) { u32 time; u32 date; /* read the time register */ time = readl(®s->time); /* read the date register */ date = readl(®s->date); /* test for 12 hour clock (can't tell if it's am/pm) */ if (time & MVRTC_HRFMT_MSK) { printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n"); return -1; } /* time */ t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK); t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK); t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK); t->tm_wday--; /* date */ t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK); t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK); t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK); t->tm_year += CENTURY * 100; /* not supported in this RTC */ t->tm_yday = 0; t->tm_isdst = 0; return 0; } #ifndef CONFIG_DM_RTC int rtc_get(struct rtc_time *t) { struct mvrtc_registers *regs; regs = (struct mvrtc_registers *)KW_RTC_BASE; return __mv_rtc_get(regs, t); } #endif /* !CONFIG_DM_RTC */ static int __mv_rtc_set(struct mvrtc_registers *regs, const struct rtc_time *t) { u32 time = 0; /* sets hour format bit to zero, 24hr format. */ u32 date = 0; /* check that this code isn't 80+ years old ;-) */ if ((t->tm_year / 100) != CENTURY) printf("Warning: Only century %d supported.\n", CENTURY); /* time */ time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT; time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT; time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT; time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT; /* date */ date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT; date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT; date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT; /* write the time register */ writel(time, ®s->time); /* write the date register */ writel(date, ®s->date); return 0; } #ifndef CONFIG_DM_RTC int rtc_set(struct rtc_time *t) { struct mvrtc_registers *regs; regs = (struct mvrtc_registers *)KW_RTC_BASE; return __mv_rtc_set(regs, t); } #endif /* !CONFIG_DM_RTC */ static void __mv_rtc_reset(struct mvrtc_registers *regs) { u32 time; u32 sec; /* no init routine for this RTC needed, just check that it's working */ time = readl(®s->time); sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); udelay(1000000); time = readl(®s->time); if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK)) printf("Error: RTC did not increment.\n"); } #ifndef CONFIG_DM_RTC void rtc_reset(void) { struct mvrtc_registers *regs; regs = (struct mvrtc_registers *)KW_RTC_BASE; __mv_rtc_reset(regs); } #endif /* !CONFIG_DM_RTC */ #ifdef CONFIG_DM_RTC static int mv_rtc_get(struct udevice *dev, struct rtc_time *tm) { struct mvrtc_pdata *pdata = dev_get_platdata(dev); struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase; return __mv_rtc_get(regs, tm); } static int mv_rtc_set(struct udevice *dev, const struct rtc_time *tm) { struct mvrtc_pdata *pdata = dev_get_platdata(dev); struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase; return __mv_rtc_set(regs, tm); } static int mv_rtc_reset(struct udevice *dev) { struct mvrtc_pdata *pdata = dev_get_platdata(dev); struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase; __mv_rtc_reset(regs); return 0; } static const struct rtc_ops mv_rtc_ops = { .get = mv_rtc_get, .set = mv_rtc_set, .reset = mv_rtc_reset, }; static const struct udevice_id mv_rtc_ids[] = { { .compatible = "marvell,kirkwood-rtc" }, { .compatible = "marvell,orion-rtc" }, { } }; static int mv_rtc_ofdata_to_platdata(struct udevice *dev) { struct mvrtc_pdata *pdata = dev_get_platdata(dev); pdata->iobase = devfdt_get_addr(dev); return 0; } U_BOOT_DRIVER(rtc_mv) = { .name = "rtc-mv", .id = UCLASS_RTC, .ofdata_to_platdata = mv_rtc_ofdata_to_platdata, .of_match = mv_rtc_ids, .ops = &mv_rtc_ops, }; #endif /* CONFIG_DM_RTC */