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iMX28: Add driver for internal RTC

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Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
This commit is contained in:
Marek Vasut 2011-11-08 23:18:17 +00:00 committed by Stefano Babic
parent 0d4e850980
commit aa711b11c9
2 changed files with 87 additions and 0 deletions
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1
drivers/rtc/Makefile
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@ -57,6 +57,7 @@ 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-$(CONFIG_RTC_MXS) += mxsrtc.o
COBJS-$(CONFIG_RTC_PCF8563) += pcf8563.o
COBJS-$(CONFIG_RTC_PL031) += pl031.o
COBJS-$(CONFIG_RTC_PT7C4338) += pt7c4338.o

86
drivers/rtc/mxsrtc.c Normal file
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@ -0,0 +1,86 @@
/*
* Freescale i.MX28 RTC Driver
*
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
* on behalf of DENX Software Engineering GmbH
*
* 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
*
*/
#include <common.h>
#include <rtc.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#define MXS_RTC_MAX_TIMEOUT 1000000
/* Set time in seconds since 1970-01-01 */
int mxs_rtc_set_time(uint32_t secs)
{
struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE;
int ret;
writel(secs, &rtc_regs->hw_rtc_seconds);
/*
* The 0x80 here means seconds were copied to analog. This information
* is taken from the linux kernel driver for the STMP37xx RTC since
* documentation doesn't mention it.
*/
ret = mx28_wait_mask_clr(&rtc_regs->hw_rtc_stat_reg,
0x80 << RTC_STAT_STALE_REGS_OFFSET, MXS_RTC_MAX_TIMEOUT);
if (ret)
printf("MXS RTC: Timeout waiting for update\n");
return ret;
}
int rtc_get(struct rtc_time *time)
{
struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE;
uint32_t secs;
secs = readl(&rtc_regs->hw_rtc_seconds);
to_tm(secs, time);
return 0;
}
int rtc_set(struct rtc_time *time)
{
uint32_t secs;
secs = mktime(time->tm_year, time->tm_mon, time->tm_mday,
time->tm_hour, time->tm_min, time->tm_sec);
return mxs_rtc_set_time(secs);
}
void rtc_reset(void)
{
struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE;
int ret;
/* Set time to 1970-01-01 */
mxs_rtc_set_time(0);
/* Reset the RTC block */
ret = mx28_reset_block(&rtc_regs->hw_rtc_ctrl_reg);
if (ret)
printf("MXS RTC: Block reset timeout\n");
}