diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/rtc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/rtc/mxsrtc.c | 86 |
2 files changed, 87 insertions, 0 deletions
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index a16f59051..faf4fcdb8 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -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 diff --git a/drivers/rtc/mxsrtc.c b/drivers/rtc/mxsrtc.c new file mode 100644 index 000000000..5beb1a044 --- /dev/null +++ b/drivers/rtc/mxsrtc.c @@ -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"); +} |