[U-Boot] [PATCH 10/20] iMX28: Add driver for internal RTC

[Stefano Babic <sbabic@denx.de>]

On 11/09/2011 10:18 AM, Marek Vasut wrote:
> 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>
> ---
>  drivers/rtc/Makefile |    1 +
>  drivers/rtc/mxsrtc.c |   86 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 87 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/rtc/mxsrtc.c
> 
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index a16f590..faf4fcd 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 0000000..5beb1a0
> --- /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");
> +}

Applied to u-boot-imx, thanks.

Best regards,
Stefano Babic


-- 
=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================