[U-Boot] [PATCH] drivers/rtc: add Marvell Integrated RTC.
Simon Guinot
simon at sequanux.org
Mon Aug 1 13:49:58 CEST 2011
Hi Jason,
On Mon, Aug 01, 2011 at 12:48:05AM +0000, Jason Cooper wrote:
> This driver can be used for kirkwood SoCs by enabling CONFIG_RTC_MVINTEG.
> Tested on Global Scale Technologies Dreamplug.
>
> Signed-off-by: Jason Cooper <u-boot at lakedaemon.net>
> ---
> Changes from v1:
> - renamed files to mvrtc.{c,h}
> - used proper c-structs for register access
> - used existing macros for register access
> - removed RFC
>
> arch/arm/include/asm/arch-kirkwood/kirkwood.h | 1 +
> drivers/rtc/Makefile | 1 +
> drivers/rtc/mvrtc.c | 157 +++++++++++++++++++++++++
> drivers/rtc/mvrtc.h | 79 +++++++++++++
> 4 files changed, 238 insertions(+), 0 deletions(-)
> create mode 100644 drivers/rtc/mvrtc.c
> create mode 100644 drivers/rtc/mvrtc.h
>
> diff --git a/arch/arm/include/asm/arch-kirkwood/kirkwood.h b/arch/arm/include/asm/arch-kirkwood/kirkwood.h
> index 0104418..3c843a0 100644
> --- a/arch/arm/include/asm/arch-kirkwood/kirkwood.h
> +++ b/arch/arm/include/asm/arch-kirkwood/kirkwood.h
> @@ -50,6 +50,7 @@
> #define KW_MPP_BASE (KW_REGISTER(0x10000))
> #define KW_GPIO0_BASE (KW_REGISTER(0x10100))
> #define KW_GPIO1_BASE (KW_REGISTER(0x10140))
> +#define KW_RTC_BASE (KW_REGISTER(0x10300))
> #define KW_NANDF_BASE (KW_REGISTER(0x10418))
> #define KW_SPI_BASE (KW_REGISTER(0x10600))
> #define KW_CPU_WIN_BASE (KW_REGISTER(0x20000))
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index e4be4a4..e1591a0 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-$(CONFIG_RTC_MVINTEG) += mvrtc.o
What about using CONFIG_RTC_MV ?
> COBJS-$(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..0db3b20
> --- /dev/null
> +++ b/drivers/rtc/mvrtc.c
> @@ -0,0 +1,157 @@
> +/*
> + * Copyright (C) 2011
> + * Jason Cooper <u-boot at 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;
> + u8 tens;
> + u8 single;
Maybe you could use the function bcd2bin() and then hide the "tens" and
"single" split.
> + 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);
For example, you could have something like:
t->tm_sec = bcd2bin(time & 0x7f);
t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & 0x7f);
t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & 0x3f); /* 24 hour mode */
...
> +
> + /* seconds */
> + tens = ((time & MVRTC_10SEC_MSK) >> MVRTC_10SEC_SFT);
> + single = ((time & MVRTC_SEC_MSK) >> MVRTC_SEC_SFT);
> + t->tm_sec = 10 * tens + single;
> +
> + /* minutes */
> + tens = ((time & MVRTC_10MIN_MSK) >> MVRTC_10MIN_SFT);
> + single = ((time & MVRTC_MIN_MSK) >> MVRTC_MIN_SFT);
> + t->tm_min = 10 * tens + single;
> +
> + /* hours */
> + tens = ((time & MVRTC_10HOUR_MSK) >> MVRTC_10HOUR_SFT);
> + single = ((time & MVRTC_HOUR_MSK) >> MVRTC_HOUR_SFT);
> + t->tm_hour = 10 * tens + single;
If the RTC operates in 12 hour mode, the code above is wrong.
> +
> + /* day */
> + t->tm_wday = ((time & MVRTC_DAY_MSK) >> MVRTC_DAY_SFT);
> + t->tm_wday--;
> +
> + /* date */
> + tens = ((date & MVRTC_10DATE_MSK) >> MVRTC_10DATE_SFT);
> + single = ((date & MVRTC_DATE_MSK) >> MVRTC_DATE_SFT);
> + t->tm_mday = 10 * tens + single;
> +
> + /* month */
> + tens = ((date & MVRTC_10MON_MSK) >> MVRTC_10MON_SFT);
> + single = ((date & MVRTC_MON_MSK) >> MVRTC_MON_SFT);
> + t->tm_mon = 10 * tens + single;
> +
> + /* year */
> + tens = ((date & MVRTC_10YEAR_MSK) >> MVRTC_10YEAR_SFT);
> + single = ((date & MVRTC_YEAR_MSK) >> MVRTC_YEAR_SFT);
> + t->tm_year = (CENTURY * 100) + (10 * tens) + single;
> +
> + /* 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;
> + u32 date = 0;
> + u32 tens;
> + u32 single;
> + struct mvrtc_registers *mvrtc_regs;
> +
> + mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
> +
> + /* seconds */
> + tens = t->tm_sec / 10;
> + single = t->tm_sec % 10;
Again, you could use the function bin2bcd() and then get ride of this
"tens" and "single" split.
> + time |= ((tens << MVRTC_10SEC_SFT) & MVRTC_10SEC_MSK) |
> + ((single << MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
For example, here you could have:
time |= bin2bcd(tm->tm_sec) << MVRTC_SEC_SFT;
> +
> + /* minutes */
> + tens = t->tm_min / 10;
> + single = t->tm_min % 10;
> + time |= ((tens << MVRTC_10MIN_SFT) & MVRTC_10MIN_MSK) |
> + ((single << MVRTC_MIN_SFT) & MVRTC_MIN_MSK);
> +
> + /* hours (24) */
> + tens = t->tm_hour / 10;
> + single = t->tm_hour % 10;
> + time |= ((tens << MVRTC_10HOUR_SFT) & MVRTC_10HOUR_MSK) |
> + ((single << MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
> +
> + /* day */
> + single = t->tm_wday + 1;
> + time |= ((single << MVRTC_DAY_SFT) & MVRTC_DAY_MSK);
> +
> + /* date */
> + tens = t->tm_mday / 10;
> + single = t->tm_mday % 10;
> + date |= ((tens << MVRTC_10DATE_SFT) & MVRTC_10DATE_MSK) |
> + ((single << MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
> +
> + /* month */
> + tens = t->tm_mon / 10;
> + single = t->tm_mon % 10;
> + date |= ((tens << MVRTC_10MON_SFT) & MVRTC_10MON_MSK) |
> + ((single << MVRTC_MON_SFT) & MVRTC_MON_MSK);
> +
> + /* year */
> + if ((t->tm_year / 100) != CENTURY)
> + printf("Warning: Only century %d supported.\n", CENTURY);
> + tens = (t->tm_year % 100) / 10;
> + single = (t->tm_year % 100) % 10;
> + date |= ((tens << MVRTC_10YEAR_SFT) & MVRTC_10YEAR_MSK) |
> + ((single << MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
> +
> + /* write the time register */
> + writel(time, &mvrtc_regs->time);
> +
> + /* write the date register */
> + writel(date, &mvrtc_regs->date);
> +
> + return 0;
> +}
> +
> +void rtc_reset(void)
> +{
> + /* no init routine for this RTC needed */
In the Linux driver, there is also a check to ensure that the RTC is
ticking. Maybe it could be useful here too, just to let know the RTC is
functional (or not).
Regards,
Simon
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