Re: [PATCH 5/6 v4] rtc: Add support for the RTC in VIA VT8500 and compatibles

From: Alexey Charkov
Date: Tue Nov 23 2010 - 14:17:46 EST

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2010/11/14 Alexey Charkov <alchark@xxxxxxxxx>:
> This adds a driver for the RTC devices in VIA and WonderMedia
> Systems-on-Chip. Alarm, 1Hz interrupts, reading and setting time
> are supported.
>
> Signed-off-by: Alexey Charkov <alchark@xxxxxxxxx>
> ---
>
> Thanks for the comments, Lars! This version implements the latest
> ones as well.
>
> Best regards,
> Alexey
>
> Âdrivers/rtc/Kconfig Â Â Â| Â Â7 +
> Âdrivers/rtc/Makefile Â Â | Â Â1 +
> Âdrivers/rtc/rtc-vt8500.c | Â359 ++++++++++++++++++++++++++++++++++++++++++++++
> Â3 files changed, 367 insertions(+), 0 deletions(-)
> Âcreate mode 100644 drivers/rtc/rtc-vt8500.c
>
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 2883428..27ed129 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -865,6 +865,13 @@ config RTC_DRV_PXA
> Â Â Â Â ÂThis RTC driver uses PXA RTC registers available since pxa27x
> Â Â Â Â Âseries (RDxR, RYxR) instead of legacy RCNR, RTAR.
>
> +config RTC_DRV_VT8500
> + Â Â Â tristate "VIA/WonderMedia 85xx SoC RTC"
> + Â Â Â depends on ARCH_VT8500
> + Â Â Â help
> + Â Â Â Â If you say Y here you will get access to the real time clock
> + Â Â Â Â built into your VIA VT8500 SoC or its relatives.
> +
>
> Âconfig RTC_DRV_SUN4V
> Â Â Â Âbool "SUN4V Hypervisor RTC"
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index 4c2832d..1a354e1 100644
> --- a/drivers/rtc/Makefile
> +++ b/drivers/rtc/Makefile
> @@ -97,6 +97,7 @@ obj-$(CONFIG_RTC_DRV_TWL4030) += rtc-twl.o
> Âobj-$(CONFIG_RTC_DRV_TX4939) Â += rtc-tx4939.o
> Âobj-$(CONFIG_RTC_DRV_V3020) Â Â+= rtc-v3020.o
> Âobj-$(CONFIG_RTC_DRV_VR41XX) Â += rtc-vr41xx.o
> +obj-$(CONFIG_RTC_DRV_VT8500) Â += rtc-vt8500.o
> Âobj-$(CONFIG_RTC_DRV_WM831X) Â += rtc-wm831x.o
> Âobj-$(CONFIG_RTC_DRV_WM8350) Â += rtc-wm8350.o
> Âobj-$(CONFIG_RTC_DRV_X1205) Â Â+= rtc-x1205.o
> diff --git a/drivers/rtc/rtc-vt8500.c b/drivers/rtc/rtc-vt8500.c
> new file mode 100644
> index 0000000..cdf4f63
> --- /dev/null
> +++ b/drivers/rtc/rtc-vt8500.c
> @@ -0,0 +1,359 @@
> +/*
> + * drivers/rtc/rtc-vt8500.c
> + *
> + * ÂCopyright (C) 2010 Alexey Charkov <alchark@xxxxxxxxx>
> + *
> + * Based on rtc-pxa.c
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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. ÂSee the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/rtc.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/bcd.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +/*
> + * Register definitions
> + */
> +#define VT8500_RTC_TS Â Â Â Â Â0x00 Â Â/* Time set */
> +#define VT8500_RTC_DS Â Â Â Â Â0x04 Â Â/* Date set */
> +#define VT8500_RTC_AS Â Â Â Â Â0x08 Â Â/* Alarm set */
> +#define VT8500_RTC_CR Â Â Â Â Â0x0c Â Â/* Control */
> +#define VT8500_RTC_TR Â Â Â Â Â0x10 Â Â/* Time read */
> +#define VT8500_RTC_DR Â Â Â Â Â0x14 Â Â/* Date read */
> +#define VT8500_RTC_WS Â Â Â Â Â0x18 Â Â/* Write status */
> +#define VT8500_RTC_CL Â Â Â Â Â0x20 Â Â/* Calibration */
> +#define VT8500_RTC_IS Â Â Â Â Â0x24 Â Â/* Interrupt status */
> +#define VT8500_RTC_ST Â Â Â Â Â0x28 Â Â/* Status */
> +
> +#define INVALID_TIME_BIT Â Â Â (1 << 31)
> +
> +#define DATE_CENTURY_S Â Â Â Â 19
> +#define DATE_YEAR_S Â Â Â Â Â Â11
> +#define DATE_YEAR_MASK Â Â Â Â (0xff << DATE_YEAR_S)
> +#define DATE_MONTH_S Â Â Â Â Â 6
> +#define DATE_MONTH_MASK Â Â Â Â Â Â Â Â(0x1f << DATE_MONTH_S)
> +#define DATE_DAY_MASK Â Â Â Â Â0x3f
> +
> +#define TIME_DOW_S Â Â Â Â Â Â 20
> +#define TIME_DOW_MASK Â Â Â Â Â(0x07 << TIME_DOW_S)
> +#define TIME_HOUR_S Â Â Â Â Â Â14
> +#define TIME_HOUR_MASK Â Â Â Â (0x3f << TIME_HOUR_S)
> +#define TIME_MIN_S Â Â Â Â Â Â 7
> +#define TIME_MIN_MASK Â Â Â Â Â(0x7f << TIME_MIN_S)
> +#define TIME_SEC_MASK Â Â Â Â Â0x7f
> +
> +#define ALARM_DAY_S Â Â Â Â Â Â20
> +#define ALARM_DAY_MASK Â Â Â Â (0x3f << ALARM_DAY_S)
> +
> +#define ALARM_DAY_BIT Â Â Â Â Â(1 << 29)
> +#define ALARM_HOUR_BIT Â Â Â Â (1 << 28)
> +#define ALARM_MIN_BIT Â Â Â Â Â(1 << 27)
> +#define ALARM_SEC_BIT Â Â Â Â Â(1 << 26)
> +
> +#define ALARM_ENABLE_MASK Â Â Â(ALARM_DAY_BIT \
> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â | ALARM_HOUR_BIT \
> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â | ALARM_MIN_BIT \
> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â | ALARM_SEC_BIT)
> +
> +#define VT8500_RTC_CR_ENABLE Â (1 << 0) Â Â Â Â/* Enable RTC */
> +#define VT8500_RTC_CR_24H Â Â Â(1 << 1) Â Â Â Â/* 24h time format */
> +#define VT8500_RTC_CR_SM_ENABLE Â Â Â Â(1 << 2) Â Â Â Â/* Enable periodic irqs */
> +#define VT8500_RTC_CR_SM_SEC Â (1 << 3) Â Â Â Â/* 0: 1Hz/60, 1: 1Hz */
> +#define VT8500_RTC_CR_CALIB Â Â(1 << 4) Â Â Â Â/* Enable calibration */
> +
> +struct vt8500_rtc {
> + Â Â Â void __iomem Â Â Â Â Â Â*regbase;
> + Â Â Â int Â Â Â Â Â Â Â Â Â Â irq_alarm;
> + Â Â Â int Â Â Â Â Â Â Â Â Â Â irq_hz;
> + Â Â Â struct rtc_device Â Â Â *rtc;
> + Â Â Â spinlock_t Â Â Â Â Â Â Âlock; Â Â Â Â Â /* Protects this structure */
> +};
> +
> +static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id)
> +{
> + Â Â Â struct vt8500_rtc *vt8500_rtc = dev_id;
> + Â Â Â u32 isr;
> + Â Â Â unsigned long events = 0;
> +
> + Â Â Â spin_lock(&vt8500_rtc->lock);
> +
> + Â Â Â /* clear interrupt sources */
> + Â Â Â isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS);
> + Â Â Â writel(isr, vt8500_rtc->regbase + VT8500_RTC_IS);
> +
> + Â Â Â spin_unlock(&vt8500_rtc->lock);
> +
> + Â Â Â if (isr & 1)
> + Â Â Â Â Â Â Â events |= RTC_AF | RTC_IRQF;
> +
> + Â Â Â /* Only second/minute interrupts are supported */
> + Â Â Â if (isr & 2)
> + Â Â Â Â Â Â Â events |= RTC_UF | RTC_IRQF;
> +
> + Â Â Â rtc_update_irq(vt8500_rtc->rtc, 1, events);
> +
> + Â Â Â return IRQ_HANDLED;
> +}
> +
> +static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
> +{
> + Â Â Â struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
> + Â Â Â u32 date, time;
> +
> + Â Â Â if (!readl(vt8500_rtc->regbase + VT8500_RTC_ST)) {
> + Â Â Â Â Â Â Â dev_info(dev, "Clock not set!");
> + Â Â Â Â Â Â Â return -EINVAL;
> + Â Â Â }
> + Â Â Â date = readl(vt8500_rtc->regbase + VT8500_RTC_DR);
> + Â Â Â time = readl(vt8500_rtc->regbase + VT8500_RTC_TR);
> +
> + Â Â Â tm->tm_sec = bcd2bin(time & TIME_SEC_MASK);
> + Â Â Â tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S);
> + Â Â Â tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S);
> + Â Â Â tm->tm_mday = bcd2bin(date & DATE_DAY_MASK);
> + Â Â Â tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S);
> + Â Â Â tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S);
> + Â Â Â tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S;
> +
> + Â Â Â return rtc_valid_tm(tm);
> +}
> +
> +static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm)
> +{
> + Â Â Â struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
> +
> + Â Â Â writel((bin2bcd(tm->tm_year) << DATE_YEAR_S)
> + Â Â Â Â Â Â Â | (bin2bcd(tm->tm_mon) << DATE_MONTH_S)
> + Â Â Â Â Â Â Â | (bin2bcd(tm->tm_mday)),
> + Â Â Â Â Â Â Â vt8500_rtc->regbase + VT8500_RTC_DS);
> + Â Â Â writel((bin2bcd(tm->tm_wday) << TIME_DOW_S)
> + Â Â Â Â Â Â Â | (bin2bcd(tm->tm_hour) << TIME_HOUR_S)
> + Â Â Â Â Â Â Â | (bin2bcd(tm->tm_min) << TIME_MIN_S)
> + Â Â Â Â Â Â Â | (bin2bcd(tm->tm_sec)),
> + Â Â Â Â Â Â Â vt8500_rtc->regbase + VT8500_RTC_TS);
> +
> + Â Â Â return 0;
> +}
> +
> +static int vt8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + Â Â Â struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
> + Â Â Â u32 isr, alarm;
> +
> + Â Â Â alarm = readl(vt8500_rtc->regbase + VT8500_RTC_AS);
> + Â Â Â isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS);
> +
> + Â Â Â alrm->time.tm_mday = bcd2bin((alarm & ALARM_DAY_MASK) >> ALARM_DAY_S);
> + Â Â Â alrm->time.tm_hour = bcd2bin((alarm & TIME_HOUR_MASK) >> TIME_HOUR_S);
> + Â Â Â alrm->time.tm_min = bcd2bin((alarm & TIME_MIN_MASK) >> TIME_MIN_S);
> + Â Â Â alrm->time.tm_sec = bcd2bin((alarm & TIME_SEC_MASK));
> +
> + Â Â Â alrm->enabled = (alarm & ALARM_ENABLE_MASK) ? 1 : 0;
> +
> + Â Â Â alrm->pending = (isr & 1) ? 1 : 0;
> + Â Â Â return rtc_valid_tm(&alrm->time);
> +}
> +
> +static int vt8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + Â Â Â struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
> +
> + Â Â Â writel((alrm->enabled ? ALARM_ENABLE_MASK : 0)
> + Â Â Â Â Â Â Â | (bin2bcd(alrm->time.tm_mday) << ALARM_DAY_S)
> + Â Â Â Â Â Â Â | (bin2bcd(alrm->time.tm_hour) << TIME_HOUR_S)
> + Â Â Â Â Â Â Â | (bin2bcd(alrm->time.tm_min) << TIME_MIN_S)
> + Â Â Â Â Â Â Â | (bin2bcd(alrm->time.tm_sec)),
> + Â Â Â Â Â Â Â vt8500_rtc->regbase + VT8500_RTC_AS);
> +
> + Â Â Â return 0;
> +}
> +
> +static int vt8500_alarm_irq_enable(struct device *dev, unsigned int enabled)
> +{
> + Â Â Â struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
> + Â Â Â unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS);
> +
> + Â Â Â if (enabled)
> + Â Â Â Â Â Â Â tmp |= ALARM_ENABLE_MASK;
> + Â Â Â else
> + Â Â Â Â Â Â Â tmp &= ~ALARM_ENABLE_MASK;
> +
> + Â Â Â writel(tmp, vt8500_rtc->regbase + VT8500_RTC_AS);
> + Â Â Â return 0;
> +}
> +
> +static int vt8500_update_irq_enable(struct device *dev, unsigned int enabled)
> +{
> + Â Â Â struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
> + Â Â Â unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_CR);
> +
> + Â Â Â if (enabled)
> + Â Â Â Â Â Â Â tmp |= VT8500_RTC_CR_SM_SEC | VT8500_RTC_CR_SM_ENABLE;
> + Â Â Â else
> + Â Â Â Â Â Â Â tmp &= ~VT8500_RTC_CR_SM_ENABLE;
> +
> + Â Â Â writel(tmp, vt8500_rtc->regbase + VT8500_RTC_CR);
> + Â Â Â return 0;
> +}
> +
> +static const struct rtc_class_ops vt8500_rtc_ops = {
> + Â Â Â .read_time = vt8500_rtc_read_time,
> + Â Â Â .set_time = vt8500_rtc_set_time,
> + Â Â Â .read_alarm = vt8500_rtc_read_alarm,
> + Â Â Â .set_alarm = vt8500_rtc_set_alarm,
> + Â Â Â .alarm_irq_enable = vt8500_alarm_irq_enable,
> + Â Â Â .update_irq_enable = vt8500_update_irq_enable,
> +};
> +
> +static int __devinit vt8500_rtc_probe(struct platform_device *pdev)
> +{
> + Â Â Â struct vt8500_rtc *vt8500_rtc;
> + Â Â Â struct resource *res;
> + Â Â Â int ret;
> +
> + Â Â Â vt8500_rtc = kzalloc(sizeof(struct vt8500_rtc), GFP_KERNEL);
> + Â Â Â if (!vt8500_rtc)
> + Â Â Â Â Â Â Â return -ENOMEM;
> +
> + Â Â Â spin_lock_init(&vt8500_rtc->lock);
> + Â Â Â platform_set_drvdata(pdev, vt8500_rtc);
> +
> + Â Â Â res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + Â Â Â if (!res) {
> + Â Â Â Â Â Â Â dev_err(&pdev->dev, "No I/O memory resource defined\n");
> + Â Â Â Â Â Â Â ret = -ENXIO;
> + Â Â Â Â Â Â Â goto err_free;
> + Â Â Â }
> +
> + Â Â Â vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0);
> + Â Â Â if (vt8500_rtc->irq_alarm < 0) {
> + Â Â Â Â Â Â Â dev_err(&pdev->dev, "No alarm IRQ resource defined\n");
> + Â Â Â Â Â Â Â ret = -ENXIO;
> + Â Â Â Â Â Â Â goto err_free;
> + Â Â Â }
> +
> + Â Â Â vt8500_rtc->irq_hz = platform_get_irq(pdev, 1);
> + Â Â Â if (vt8500_rtc->irq_hz < 0) {
> + Â Â Â Â Â Â Â dev_err(&pdev->dev, "No 1Hz IRQ resource defined\n");
> + Â Â Â Â Â Â Â ret = -ENXIO;
> + Â Â Â Â Â Â Â goto err_free;
> + Â Â Â }
> +
> + Â Â Â res = request_mem_region(res->start, resource_size(res), "vt8500-rtc");
> + Â Â Â if (res == NULL) {
> + Â Â Â Â Â Â Â dev_err(&pdev->dev, "failed to request I/O memory\n");
> + Â Â Â Â Â Â Â ret = -EBUSY;
> + Â Â Â Â Â Â Â goto err_free;
> + Â Â Â }
> +
> + Â Â Â vt8500_rtc->regbase = ioremap(res->start, resource_size(res));
> + Â Â Â if (!vt8500_rtc->regbase) {
> + Â Â Â Â Â Â Â dev_err(&pdev->dev, "Unable to map RTC I/O memory\n");
> + Â Â Â Â Â Â Â ret = -EBUSY;
> + Â Â Â Â Â Â Â goto err_release;
> + Â Â Â }
> +
> + Â Â Â /* Enable the second/minute interrupt generation and enable RTC */
> + Â Â Â writel(VT8500_RTC_CR_ENABLE | VT8500_RTC_CR_24H
> + Â Â Â Â Â Â Â | VT8500_RTC_CR_SM_ENABLE | VT8500_RTC_CR_SM_SEC,
> + Â Â Â Â Â Â Âvt8500_rtc->regbase + VT8500_RTC_CR);
> +
> + Â Â Â vt8500_rtc->rtc = rtc_device_register("vt8500-rtc", &pdev->dev,
> + Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â &vt8500_rtc_ops, THIS_MODULE);
> + Â Â Â if (IS_ERR(vt8500_rtc->rtc)) {
> + Â Â Â Â Â Â Â ret = PTR_ERR(vt8500_rtc->rtc);
> + Â Â Â Â Â Â Â dev_err(&pdev->dev,
> + Â Â Â Â Â Â Â Â Â Â Â "Failed to register RTC device -> %d\n", ret);
> + Â Â Â Â Â Â Â goto err_unmap;
> + Â Â Â }
> +
> + Â Â Â ret = request_irq(vt8500_rtc->irq_hz, vt8500_rtc_irq, 0,
> + Â Â Â Â Â Â Â Â Â Â Â Â "rtc 1Hz", vt8500_rtc);
> + Â Â Â if (ret < 0) {
> + Â Â Â Â Â Â Â dev_err(&pdev->dev, "can't get irq %i, err %d\n",
> + Â Â Â Â Â Â Â Â Â Â Â vt8500_rtc->irq_hz, ret);
> + Â Â Â Â Â Â Â goto err_unreg;
> + Â Â Â }
> +
> + Â Â Â ret = request_irq(vt8500_rtc->irq_alarm, vt8500_rtc_irq, 0,
> + Â Â Â Â Â Â Â Â Â Â Â Â "rtc alarm", vt8500_rtc);
> + Â Â Â if (ret < 0) {
> + Â Â Â Â Â Â Â dev_err(&pdev->dev, "can't get irq %i, err %d\n",
> + Â Â Â Â Â Â Â Â Â Â Â vt8500_rtc->irq_alarm, ret);
> + Â Â Â Â Â Â Â goto err_free_hz;
> + Â Â Â }
> +
> + Â Â Â return 0;
> +
> +err_free_hz:
> + Â Â Â free_irq(vt8500_rtc->irq_hz, vt8500_rtc);
> +err_unreg:
> + Â Â Â rtc_device_unregister(vt8500_rtc->rtc);
> +err_unmap:
> + Â Â Â iounmap(vt8500_rtc->regbase);
> +err_release:
> + Â Â Â release_mem_region(res->start, resource_size(res));
> +err_free:
> + Â Â Â kfree(vt8500_rtc);
> + Â Â Â return ret;
> +}
> +
> +static int __devexit vt8500_rtc_remove(struct platform_device *pdev)
> +{
> + Â Â Â struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev);
> + Â Â Â struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +
> + Â Â Â free_irq(vt8500_rtc->irq_alarm, vt8500_rtc);
> + Â Â Â free_irq(vt8500_rtc->irq_hz, vt8500_rtc);
> +
> + Â Â Â rtc_device_unregister(vt8500_rtc->rtc);
> +
> + Â Â Â /* Disable alarm matching */
> + Â Â Â writel(0, vt8500_rtc->regbase + VT8500_RTC_IS);
> + Â Â Â iounmap(vt8500_rtc->regbase);
> + Â Â Â release_mem_region(res->start, resource_size(res));
> +
> + Â Â Â kfree(vt8500_rtc);
> + Â Â Â platform_set_drvdata(pdev, NULL);
> +
> + Â Â Â return 0;
> +}
> +
> +static struct platform_driver vt8500_rtc_driver = {
> + Â Â Â .probe Â Â Â Â Â= vt8500_rtc_probe,
> + Â Â Â .remove Â Â Â Â = __devexit_p(vt8500_rtc_remove),
> + Â Â Â .driver Â Â Â Â = {
> + Â Â Â Â Â Â Â .name Â = "vt8500-rtc",
> + Â Â Â Â Â Â Â .owner Â= THIS_MODULE,
> + Â Â Â },
> +};
> +
> +static int __init vt8500_rtc_init(void)
> +{
> + Â Â Â return platform_driver_register(&vt8500_rtc_driver);
> +}
> +module_init(vt8500_rtc_init);
> +
> +static void __exit vt8500_rtc_exit(void)
> +{
> + Â Â Â platform_driver_unregister(&vt8500_rtc_driver);
> +}
> +module_exit(vt8500_rtc_exit);
> +
> +MODULE_AUTHOR("Alexey Charkov <alchark@xxxxxxxxx>");
> +MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:vt8500-rtc");
> --
> 1.7.3.2
>
>

Any further comments about this code? Could it be merged now?

Lars, sorry for double-posting this (forgot to CC the lists and others
last time).

Thanks,
Alexey
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