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https://github.com/AsahiLinux/u-boot
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drivers/rtc: add Marvell Integrated RTC
This driver can be used for kirkwood SoCs by enabling CONFIG_RTC_MV. Tested on Global Scale Technologies Dreamplug. Signed-off-by: Jason Cooper <u-boot@lakedaemon.net>
This commit is contained in:
Jason Cooper
Albert ARIBAUD
parent
26749582d5
commit
b608b95753
4 changed files with 191 additions and 0 deletions
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@ -50,6 +50,7 @@
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#define KW_MPP_BASE (KW_REGISTER(0x10000))
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#define KW_GPIO0_BASE (KW_REGISTER(0x10100))
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#define KW_GPIO1_BASE (KW_REGISTER(0x10140))
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#define KW_RTC_BASE (KW_REGISTER(0x10300))
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#define KW_NANDF_BASE (KW_REGISTER(0x10418))
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#define KW_SPI_BASE (KW_REGISTER(0x10600))
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#define KW_CPU_WIN_BASE (KW_REGISTER(0x20000))
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@ -55,6 +55,7 @@ COBJS-$(CONFIG_MCFRTC) += mcfrtc.o
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COBJS-$(CONFIG_RTC_MK48T59) += mk48t59.o
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COBJS-$(CONFIG_RTC_MPC5200) += mpc5xxx.o
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COBJS-$(CONFIG_RTC_MPC8xx) += mpc8xx.o
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COBJS-$(CONFIG_RTC_MV) += mvrtc.o
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COBJS-$(CONFIG_RTC_PCF8563) += pcf8563.o
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COBJS-$(CONFIG_RTC_PL031) += pl031.o
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COBJS-$(CONFIG_RTC_PT7C4338) += pt7c4338.o
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124
drivers/rtc/mvrtc.c
Normal file
124
drivers/rtc/mvrtc.c
Normal file
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@ -0,0 +1,124 @@
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/*
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* Copyright (C) 2011
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* Jason Cooper <u-boot@lakedaemon.net>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* Date & Time support for Marvell Integrated RTC
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*/
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#include <common.h>
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#include <command.h>
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#include <rtc.h>
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#include "mvrtc.h"
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/* This RTC does not support century, so we assume 20 */
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#define CENTURY 20
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int rtc_get(struct rtc_time *t)
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{
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u32 time;
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u32 date;
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struct mvrtc_registers *mvrtc_regs;
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mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
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/* read the time register */
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time = readl(&mvrtc_regs->time);
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/* read the date register */
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date = readl(&mvrtc_regs->date);
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/* test for 12 hour clock (can't tell if it's am/pm) */
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if (time & MVRTC_HRFMT_MSK) {
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printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n");
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return -1;
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}
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/* time */
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t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
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t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK);
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t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
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t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK);
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t->tm_wday--;
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/* date */
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t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
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t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK);
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t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
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t->tm_year += CENTURY * 100;
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/* not supported in this RTC */
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t->tm_yday = 0;
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t->tm_isdst = 0;
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return 0;
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}
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int rtc_set(struct rtc_time *t)
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{
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u32 time = 0; /* sets hour format bit to zero, 24hr format. */
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u32 date = 0;
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struct mvrtc_registers *mvrtc_regs;
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mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
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/* check that this code isn't 80+ years old ;-) */
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if ((t->tm_year / 100) != CENTURY)
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printf("Warning: Only century %d supported.\n", CENTURY);
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/* time */
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time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT;
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time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT;
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time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
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time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT;
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/* date */
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date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
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date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT;
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date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
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/* write the time register */
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writel(time, &mvrtc_regs->time);
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/* write the date register */
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writel(date, &mvrtc_regs->date);
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return 0;
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}
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void rtc_reset(void)
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{
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u32 time;
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u32 sec;
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struct mvrtc_registers *mvrtc_regs;
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mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
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/* no init routine for this RTC needed, just check that it's working */
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time = readl(&mvrtc_regs->time);
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sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
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udelay(1000000);
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time = readl(&mvrtc_regs->time);
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if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
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printf("Error: RTC did not increment.\n");
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}
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65
drivers/rtc/mvrtc.h
Normal file
65
drivers/rtc/mvrtc.h
Normal file
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@ -0,0 +1,65 @@
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/*
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* Copyright (C) 2011
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* Jason Cooper <u-boot@lakedaemon.net>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* Date & Time support for Marvell Integrated RTC
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*/
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#ifndef _MVRTC_H_
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#define _MVRTC_H_
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#include <asm/arch/kirkwood.h>
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#include <compiler.h>
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/* RTC registers */
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struct mvrtc_registers {
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u32 time;
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u32 date;
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};
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/* time register */
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#define MVRTC_SEC_SFT 0
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#define MVRTC_SEC_MSK 0x7f
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#define MVRTC_MIN_SFT 8
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#define MVRTC_MIN_MSK 0x7f
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#define MVRTC_HOUR_SFT 16
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#define MVRTC_HOUR_MSK 0x3f
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#define MVRTC_DAY_SFT 24
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#define MVRTC_DAY_MSK 0x7
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/*
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* Hour format bit
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* 1 = 12 hour clock
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* 0 = 24 hour clock
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*/
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#define MVRTC_HRFMT_MSK 0x00400000
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/* date register */
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#define MVRTC_DATE_SFT 0
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#define MVRTC_DATE_MSK 0x3f
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#define MVRTC_MON_SFT 8
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#define MVRTC_MON_MSK 0x1f
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#define MVRTC_YEAR_SFT 16
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#define MVRTC_YEAR_MSK 0xff
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#endif
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