Commit ae930c91 authored by Andreas Färber's avatar Andreas Färber Committed by Alexandre Belloni
Browse files

rtc: Add Realtek RTD1295 



Based on QNAP's arch/arm/mach-rtk119x/driver/rtk_rtc_drv.c code and
mach-rtk119x/driver/dc2vo/fpga/include/mis_reg.h register definitions.

The base year 2014 was observed on all of Zidoo X9S, ProBox2 Ava and
Beelink Lake I.

Signed-off-by: default avatarAndreas Färber <afaerber@suse.de>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 69c9d96c

drivers/rtc/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -1765,6 +1765,14 @@ config RTC_DRV_CPCAP 
	   Say y here for CPCAP rtc found on some Motorola phones

	   and tablets such as Droid 4.



config RTC_DRV_RTD119X

	bool "Realtek RTD129x RTC"

	depends on ARCH_REALTEK || COMPILE_TEST

	default ARCH_REALTEK

	help

	  If you say yes here, you get support for the RTD1295 SoC

	  Real Time Clock.



comment "HID Sensor RTC drivers"



config RTC_DRV_HID_SENSOR_TIME

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -131,6 +131,7 @@ obj-$(CONFIG_RTC_DRV_RP5C01) += rtc-rp5c01.o 
obj-$(CONFIG_RTC_DRV_RS5C313)	+= rtc-rs5c313.o

obj-$(CONFIG_RTC_DRV_RS5C348)	+= rtc-rs5c348.o

obj-$(CONFIG_RTC_DRV_RS5C372)	+= rtc-rs5c372.o

obj-$(CONFIG_RTC_DRV_RTD119X)	+= rtc-rtd119x.o

obj-$(CONFIG_RTC_DRV_RV3029C2)	+= rtc-rv3029c2.o

obj-$(CONFIG_RTC_DRV_RV8803)	+= rtc-rv8803.o

obj-$(CONFIG_RTC_DRV_RX4581)	+= rtc-rx4581.o

drivers/rtc/rtc-rtd119x.c

0 → 100644
+242 −0
Original line number Diff line number Diff line 
/*

 * Realtek RTD129x RTC

 *

 * Copyright (c) 2017 Andreas Färber

 *

 * SPDX-License-Identifier: GPL-2.0+

 */



#include <linux/clk.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>

#include <linux/spinlock.h>



#define RTD_RTCSEC		0x00

#define RTD_RTCMIN		0x04

#define RTD_RTCHR		0x08

#define RTD_RTCDATE1		0x0c

#define RTD_RTCDATE2		0x10

#define RTD_RTCACR		0x28

#define RTD_RTCEN		0x2c

#define RTD_RTCCR		0x30



#define RTD_RTCSEC_RTCSEC_MASK		0x7f



#define RTD_RTCMIN_RTCMIN_MASK		0x3f



#define RTD_RTCHR_RTCHR_MASK		0x1f



#define RTD_RTCDATE1_RTCDATE1_MASK	0xff



#define RTD_RTCDATE2_RTCDATE2_MASK	0x7f



#define RTD_RTCACR_RTCPWR		BIT(7)



#define RTD_RTCEN_RTCEN_MASK		0xff



#define RTD_RTCCR_RTCRST		BIT(6)



struct rtd119x_rtc {

	void __iomem *base;

	struct clk *clk;

	struct rtc_device *rtcdev;

	unsigned int base_year;

};



static inline int rtd119x_rtc_days_in_year(int year)

{

	return 365 + (is_leap_year(year) ? 1 : 0);

}



static void rtd119x_rtc_reset(struct device *dev)

{

	struct rtd119x_rtc *data = dev_get_drvdata(dev);

	u32 val;



	val = readl_relaxed(data->base + RTD_RTCCR);

	val |= RTD_RTCCR_RTCRST;

	writel_relaxed(val, data->base + RTD_RTCCR);



	val &= ~RTD_RTCCR_RTCRST;

	writel(val, data->base + RTD_RTCCR);

}



static void rtd119x_rtc_set_enabled(struct device *dev, bool enable)

{

	struct rtd119x_rtc *data = dev_get_drvdata(dev);

	u32 val;



	val = readl_relaxed(data->base + RTD_RTCEN);

	if (enable) {

		if ((val & RTD_RTCEN_RTCEN_MASK) == 0x5a)

			return;

		writel_relaxed(0x5a, data->base + RTD_RTCEN);

	} else {

		writel_relaxed(0, data->base + RTD_RTCEN);

	}

}



static int rtd119x_rtc_read_time(struct device *dev, struct rtc_time *tm)

{

	struct rtd119x_rtc *data = dev_get_drvdata(dev);

	s32 day;

	u32 sec;

	unsigned int year;

	int tries = 0;



	while (true) {

		tm->tm_sec = (readl_relaxed(data->base + RTD_RTCSEC) & RTD_RTCSEC_RTCSEC_MASK) >> 1;

		tm->tm_min  = readl_relaxed(data->base + RTD_RTCMIN) & RTD_RTCMIN_RTCMIN_MASK;

		tm->tm_hour = readl_relaxed(data->base + RTD_RTCHR) & RTD_RTCHR_RTCHR_MASK;

		day  =  readl_relaxed(data->base + RTD_RTCDATE1) & RTD_RTCDATE1_RTCDATE1_MASK;

		day |= (readl_relaxed(data->base + RTD_RTCDATE2) & RTD_RTCDATE2_RTCDATE2_MASK) << 8;

		sec  = (readl_relaxed(data->base + RTD_RTCSEC) & RTD_RTCSEC_RTCSEC_MASK) >> 1;

		tries++;



		if (sec == tm->tm_sec)

			break;



		if (tries >= 3)

			return -EINVAL;

	}

	if (tries > 1)

		dev_dbg(dev, "%s: needed %i tries\n", __func__, tries);



	year = data->base_year;

	while (day >= rtd119x_rtc_days_in_year(year)) {

		day -= rtd119x_rtc_days_in_year(year);

		year++;

	}

	tm->tm_year = year - 1900;

	tm->tm_yday = day;



	tm->tm_mon = 0;

	while (day >= rtc_month_days(tm->tm_mon, year)) {

		day -= rtc_month_days(tm->tm_mon, year);

		tm->tm_mon++;

	}

	tm->tm_mday = day + 1;



	return 0;

}



static int rtd119x_rtc_set_time(struct device *dev, struct rtc_time *tm)

{

	struct rtd119x_rtc *data = dev_get_drvdata(dev);

	unsigned int day;

	int i;



	if (1900 + tm->tm_year < data->base_year)

		return -EINVAL;



	day = 0;

	for (i = data->base_year; i < 1900 + tm->tm_year; i++)

		day += rtd119x_rtc_days_in_year(i);



	day += tm->tm_yday;

	if (day > 0x7fff)

		return -EINVAL;



	rtd119x_rtc_set_enabled(dev, false);



	writel_relaxed((tm->tm_sec << 1) & RTD_RTCSEC_RTCSEC_MASK, data->base + RTD_RTCSEC);

	writel_relaxed(tm->tm_min & RTD_RTCMIN_RTCMIN_MASK, data->base + RTD_RTCMIN);

	writel_relaxed(tm->tm_hour & RTD_RTCHR_RTCHR_MASK, data->base + RTD_RTCHR);

	writel_relaxed(day & RTD_RTCDATE1_RTCDATE1_MASK, data->base + RTD_RTCDATE1);

	writel_relaxed((day >> 8) & RTD_RTCDATE2_RTCDATE2_MASK, data->base + RTD_RTCDATE2);



	rtd119x_rtc_set_enabled(dev, true);



	return 0;

}



static const struct rtc_class_ops rtd119x_rtc_ops = {

	.read_time	= rtd119x_rtc_read_time,

	.set_time	= rtd119x_rtc_set_time,

};



static const struct of_device_id rtd119x_rtc_dt_ids[] = {

	 { .compatible = "realtek,rtd1295-rtc" },

	 { }

};



static int rtd119x_rtc_probe(struct platform_device *pdev)

{

	struct rtd119x_rtc *data;

	struct resource *res;

	u32 val;

	int ret;



	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	platform_set_drvdata(pdev, data);

	data->base_year = 2014;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	data->base = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(data->base))

		return PTR_ERR(data->base);



	data->clk = of_clk_get(pdev->dev.of_node, 0);

	if (IS_ERR(data->clk))

		return PTR_ERR(data->clk);



	ret = clk_prepare_enable(data->clk);

	if (ret) {

		clk_put(data->clk);

		return ret;

	}



	val = readl_relaxed(data->base + RTD_RTCACR);

	if (!(val & RTD_RTCACR_RTCPWR)) {

		writel_relaxed(RTD_RTCACR_RTCPWR, data->base + RTD_RTCACR);



		rtd119x_rtc_reset(&pdev->dev);



		writel_relaxed(0, data->base + RTD_RTCMIN);

		writel_relaxed(0, data->base + RTD_RTCHR);

		writel_relaxed(0, data->base + RTD_RTCDATE1);

		writel_relaxed(0, data->base + RTD_RTCDATE2);

	}



	rtd119x_rtc_set_enabled(&pdev->dev, true);



	data->rtcdev = devm_rtc_device_register(&pdev->dev, "rtc",

						&rtd119x_rtc_ops, THIS_MODULE);

	if (IS_ERR(data->rtcdev)) {

		dev_err(&pdev->dev, "failed to register rtc device");

		clk_disable_unprepare(data->clk);

		clk_put(data->clk);

		return PTR_ERR(data->rtcdev);

	}



	return 0;

}



static int rtd119x_rtc_remove(struct platform_device *pdev)

{

	struct rtd119x_rtc *data = platform_get_drvdata(pdev);



	rtd119x_rtc_set_enabled(&pdev->dev, false);



	clk_disable_unprepare(data->clk);

	clk_put(data->clk);



	return 0;

}



static struct platform_driver rtd119x_rtc_driver = {

	.probe = rtd119x_rtc_probe,

	.remove = rtd119x_rtc_remove,

	.driver = {

		.name = "rtd1295-rtc",

		.of_match_table	= rtd119x_rtc_dt_ids,

	},

};

builtin_platform_driver(rtd119x_rtc_driver);

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