diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/rtc/mvrtc.c | 124 | ||||
| -rw-r--r-- | drivers/rtc/mvrtc.h | 65 |
3 files changed, 190 insertions, 0 deletions
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index e4be4a4..ca27745 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -55,6 +55,7 @@ COBJS-$(CONFIG_MCFRTC) += mcfrtc.o COBJS-$(CONFIG_RTC_MK48T59) += mk48t59.o COBJS-$(CONFIG_RTC_MPC5200) += mpc5xxx.o COBJS-$(CONFIG_RTC_MPC8xx) += mpc8xx.o +COBJS-$(CONFIG_RTC_MV) += mvrtc.o COBJS-$(CONFIG_RTC_PCF8563) += pcf8563.o COBJS-$(CONFIG_RTC_PL031) += pl031.o COBJS-$(CONFIG_RTC_PT7C4338) += pt7c4338.o diff --git a/drivers/rtc/mvrtc.c b/drivers/rtc/mvrtc.c new file mode 100644 index 0000000..ccc573a --- /dev/null +++ b/drivers/rtc/mvrtc.c @@ -0,0 +1,124 @@ +/* + * Copyright (C) 2011 + * Jason Cooper <u-boot@lakedaemon.net> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* + * Date & Time support for Marvell Integrated RTC + */ + +#include <common.h> +#include <command.h> +#include <rtc.h> +#include "mvrtc.h" + +/* This RTC does not support century, so we assume 20 */ +#define CENTURY 20 + +int rtc_get(struct rtc_time *t) +{ + u32 time; + u32 date; + struct mvrtc_registers *mvrtc_regs; + + mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE; + + /* read the time register */ + time = readl(&mvrtc_regs->time); + + /* read the date register */ + date = readl(&mvrtc_regs->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; +} + +int rtc_set(struct rtc_time *t) +{ + u32 time = 0; /* sets hour format bit to zero, 24hr format. */ + u32 date = 0; + struct mvrtc_registers *mvrtc_regs; + + mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE; + + /* 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, &mvrtc_regs->time); + + /* write the date register */ + writel(date, &mvrtc_regs->date); + + return 0; +} + +void rtc_reset(void) +{ + u32 time; + u32 sec; + struct mvrtc_registers *mvrtc_regs; + + mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE; + + /* no init routine for this RTC needed, just check that it's working */ + time = readl(&mvrtc_regs->time); + sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK); + udelay(1000000); + time = readl(&mvrtc_regs->time); + + if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK)) + printf("Error: RTC did not increment.\n"); +} diff --git a/drivers/rtc/mvrtc.h b/drivers/rtc/mvrtc.h new file mode 100644 index 0000000..b9d5c6f --- /dev/null +++ b/drivers/rtc/mvrtc.h @@ -0,0 +1,65 @@ +/* + * Copyright (C) 2011 + * Jason Cooper <u-boot@lakedaemon.net> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* + * Date & Time support for Marvell Integrated RTC + */ + +#ifndef _MVRTC_H_ +#define _MVRTC_H_ + +#include <asm/arch/kirkwood.h> +#include <compiler.h> + +/* RTC registers */ +struct mvrtc_registers { + u32 time; + u32 date; +}; + +/* time register */ +#define MVRTC_SEC_SFT 0 +#define MVRTC_SEC_MSK 0x7f +#define MVRTC_MIN_SFT 8 +#define MVRTC_MIN_MSK 0x7f +#define MVRTC_HOUR_SFT 16 +#define MVRTC_HOUR_MSK 0x3f +#define MVRTC_DAY_SFT 24 +#define MVRTC_DAY_MSK 0x7 + +/* + * Hour format bit + * 1 = 12 hour clock + * 0 = 24 hour clock + */ +#define MVRTC_HRFMT_MSK 0x00400000 + +/* date register */ +#define MVRTC_DATE_SFT 0 +#define MVRTC_DATE_MSK 0x3f +#define MVRTC_MON_SFT 8 +#define MVRTC_MON_MSK 0x1f +#define MVRTC_YEAR_SFT 16 +#define MVRTC_YEAR_MSK 0xff + +#endif |