rtc: driver for Marvell's SoCs 88F6281 and 88F6192 (defb4514) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/rtc/Kconfig

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		@@ -712,4 +712,15 @@ config RTC_DRV_TX4939
		Driver for the internal RTC (Realtime Clock) module found on
		Toshiba TX4939 SoC.

		config RTC_DRV_MV
		tristate "Marvell SoC RTC"
		depends on ARCH_KIRKWOOD
		help
		If you say yes here you will get support for the in-chip RTC
		that can be found in some of Marvell's SoC devices, such as
		the Kirkwood 88F6281 and 88F6192.

		This driver can also be built as a module. If so, the module
		will be called rtc-mv.

		endif # RTC_CLASS

drivers/rtc/Makefile

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		@@ -48,6 +48,7 @@ obj-$(CONFIG_RTC_DRV_SUN4V) += rtc-sun4v.o
		obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o
		obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
		obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
		obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o
		obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
		obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
		obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o

drivers/rtc/rtc-mv.c

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		/*
		* Driver for the RTC in Marvell SoCs.
		*
		* This file is licensed under the terms of the GNU General Public
		* License version 2. This program is licensed "as is" without any
		* warranty of any kind, whether express or implied.
		*/

		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/rtc.h>
		#include <linux/bcd.h>
		#include <linux/io.h>
		#include <linux/platform_device.h>


		#define RTC_TIME_REG_OFFS 0
		#define RTC_SECONDS_OFFS 0
		#define RTC_MINUTES_OFFS 8
		#define RTC_HOURS_OFFS 16
		#define RTC_WDAY_OFFS 24
		#define RTC_HOURS_12H_MODE (1 << 22) /* 12 hours mode */

		#define RTC_DATE_REG_OFFS 4
		#define RTC_MDAY_OFFS 0
		#define RTC_MONTH_OFFS 8
		#define RTC_YEAR_OFFS 16


		struct rtc_plat_data {
		struct rtc_device *rtc;
		void __iomem *ioaddr;
		};

		static int mv_rtc_set_time(struct device dev, struct rtc_time tm)
		{
		struct rtc_plat_data *pdata = dev_get_drvdata(dev);
		void __iomem *ioaddr = pdata->ioaddr;
		u32 rtc_reg;

		rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) \|
		(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) \|
		(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) \|
		(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
		writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);

		rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) \|
		(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) \|
		(bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
		writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);

		return 0;
		}

		static int mv_rtc_read_time(struct device dev, struct rtc_time tm)
		{
		struct rtc_plat_data *pdata = dev_get_drvdata(dev);
		void __iomem *ioaddr = pdata->ioaddr;
		u32 rtc_time, rtc_date;
		unsigned int year, month, day, hour, minute, second, wday;

		rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
		rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);

		second = rtc_time & 0x7f;
		minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
		hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
		wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

		day = rtc_date & 0x3f;
		month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
		year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

		tm->tm_sec = bcd2bin(second);
		tm->tm_min = bcd2bin(minute);
		tm->tm_hour = bcd2bin(hour);
		tm->tm_mday = bcd2bin(day);
		tm->tm_wday = bcd2bin(wday);
		tm->tm_mon = bcd2bin(month) - 1;
		/* hw counts from year 2000, but tm_year is relative to 1900 */
		tm->tm_year = bcd2bin(year) + 100;

		return rtc_valid_tm(tm);
		}

		static const struct rtc_class_ops mv_rtc_ops = {
		.read_time = mv_rtc_read_time,
		.set_time = mv_rtc_set_time,
		};

		static int __init mv_rtc_probe(struct platform_device *pdev)
		{
		struct resource *res;
		struct rtc_plat_data *pdata;
		resource_size_t size;
		u32 rtc_time;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!res)
		return -ENODEV;

		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
		if (!pdata)
		return -ENOMEM;

		size = resource_size(res);
		if (!devm_request_mem_region(&pdev->dev, res->start, size,
		pdev->name))
		return -EBUSY;

		pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
		if (!pdata->ioaddr)
		return -ENOMEM;

		/* make sure the 24 hours mode is enabled */
		rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
		if (rtc_time & RTC_HOURS_12H_MODE) {
		dev_err(&pdev->dev, "24 Hours mode not supported.\n");
		return -EINVAL;
		}

		platform_set_drvdata(pdev, pdata);
		pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
		&mv_rtc_ops, THIS_MODULE);
		if (IS_ERR(pdata->rtc))
		return PTR_ERR(pdata->rtc);

		return 0;
		}

		static int __exit mv_rtc_remove(struct platform_device *pdev)
		{
		struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

		rtc_device_unregister(pdata->rtc);
		return 0;
		}

		static struct platform_driver mv_rtc_driver = {
		.remove = __exit_p(mv_rtc_remove),
		.driver = {
		.name = "rtc-mv",
		.owner = THIS_MODULE,
		},
		};

		static __init int mv_init(void)
		{
		return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
		}

		static __exit void mv_exit(void)
		{
		platform_driver_unregister(&mv_rtc_driver);
		}

		module_init(mv_init);
		module_exit(mv_exit);

		MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
		MODULE_DESCRIPTION("Marvell RTC driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:rtc-mv");