// SPDX-License-Identifier: GPL-2.0-or-later/* *  Faraday Technology FTRTC010 driver * *  Copyright (C) 2009 Janos Laube <janos.dev@gmail.com> * * Original code for older kernel 2.6.15 are from Stormlinksemi * first update from Janos Laube for > 2.6.29 kernels * * checkpatch fixes and usage of rtc-lib code * Hans Ulli Kroll <ulli.kroll@googlemail.com> */ #include <linux/rtc.h>#include <linux/io.h>#include <linux/slab.h>#include <linux/platform_device.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/clk.h> #define DRV_NAME        "rtc-ftrtc010" MODULE_AUTHOR("Hans Ulli Kroll <ulli.kroll@googlemail.com>");MODULE_DESCRIPTION("RTC driver for Gemini SoC");MODULE_LICENSE("GPL");MODULE_ALIAS("platform:" DRV_NAME); struct ftrtc010_rtc {	void __iomem		*rtc_base;	int			rtc_irq;	struct clk		*pclk;	struct clk		*extclk;}; enum ftrtc010_rtc_offsets {	FTRTC010_RTC_SECOND		= 0x00,	FTRTC010_RTC_MINUTE		= 0x04,	FTRTC010_RTC_HOUR		= 0x08,	FTRTC010_RTC_DAYS		= 0x0C,	FTRTC010_RTC_ALARM_SECOND	= 0x10,	FTRTC010_RTC_ALARM_MINUTE	= 0x14,	FTRTC010_RTC_ALARM_HOUR		= 0x18,	FTRTC010_RTC_RECORD		= 0x1C,	FTRTC010_RTC_CR			= 0x20,}; static irqreturn_t ftrtc010_rtc_interrupt(int irq, void *dev){	return IRQ_HANDLED;} /* * Looks like the RTC in the Gemini SoC is (totaly) broken * We can't read/write directly the time from RTC registers. * We must do some "offset" calculation to get the real time * * This FIX works pretty fine and Stormlinksemi aka Cortina-Networks does * the same thing, without the rtc-lib.c calls. */ static int ftrtc010_rtc_read_time(struct device *dev, struct rtc_time *tm){	struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); 	u32 days, hour, min, sec, offset;	timeu64_t time; 	sec  = readl(rtc->rtc_base + FTRTC010_RTC_SECOND);	min  = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE);	hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR);	days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS);	offset = readl(rtc->rtc_base + FTRTC010_RTC_RECORD); 	time = offset + days * 86400 + hour * 3600 + min * 60 + sec; 	rtc_time64_to_tm(time, tm); 	return 0;} static int ftrtc010_rtc_set_time(struct device *dev, struct rtc_time *tm){	struct ftrtc010_rtc *rtc = dev_get_drvdata(dev);	u32 sec, min, hour, day, offset;	timeu64_t time; 	time = rtc_tm_to_time64(tm); 	sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND);	min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE);	hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR);	day = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); 	offset = time - (day * 86400 + hour * 3600 + min * 60 + sec); 	writel(offset, rtc->rtc_base + FTRTC010_RTC_RECORD);	writel(0x01, rtc->rtc_base + FTRTC010_RTC_CR); 	return 0;} static const struct rtc_class_ops ftrtc010_rtc_ops = {	.read_time     = ftrtc010_rtc_read_time,	.set_time      = ftrtc010_rtc_set_time,}; static int ftrtc010_rtc_probe(struct platform_device *pdev){	u32 days, hour, min, sec;	struct ftrtc010_rtc *rtc;	struct device *dev = &pdev->dev;	struct resource *res;	struct rtc_device *rtc_dev;	int ret; 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);	if (unlikely(!rtc))		return -ENOMEM;	platform_set_drvdata(pdev, rtc); 	rtc->pclk = devm_clk_get(dev, "PCLK");	if (IS_ERR(rtc->pclk)) {		dev_err(dev, "could not get PCLK\n");	} else {		ret = clk_prepare_enable(rtc->pclk);		if (ret) {			dev_err(dev, "failed to enable PCLK\n");			return ret;		}	}	rtc->extclk = devm_clk_get(dev, "EXTCLK");	if (IS_ERR(rtc->extclk)) {		dev_err(dev, "could not get EXTCLK\n");	} else {		ret = clk_prepare_enable(rtc->extclk);		if (ret) {			dev_err(dev, "failed to enable EXTCLK\n");			goto err_disable_pclk;		}	} 	rtc->rtc_irq = platform_get_irq(pdev, 0);	if (rtc->rtc_irq < 0) {		ret = rtc->rtc_irq;		goto err_disable_extclk;	} 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);	if (!res) {		ret = -ENODEV;		goto err_disable_extclk;	} 	rtc->rtc_base = devm_ioremap(dev, res->start,				     resource_size(res));	if (!rtc->rtc_base) {		ret = -ENOMEM;		goto err_disable_extclk;	} 	rtc_dev = devm_rtc_allocate_device(dev);	if (IS_ERR(rtc_dev)) {		ret = PTR_ERR(rtc_dev);		goto err_disable_extclk;	} 	rtc_dev->ops = &ftrtc010_rtc_ops; 	sec  = readl(rtc->rtc_base + FTRTC010_RTC_SECOND);	min  = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE);	hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR);	days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); 	rtc_dev->range_min = (u64)days * 86400 + hour * 3600 + min * 60 + sec;	rtc_dev->range_max = U32_MAX + rtc_dev->range_min; 	ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt,			       IRQF_SHARED, pdev->name, dev);	if (unlikely(ret))		goto err_disable_extclk; 	return devm_rtc_register_device(rtc_dev); err_disable_extclk:	clk_disable_unprepare(rtc->extclk);err_disable_pclk:	clk_disable_unprepare(rtc->pclk);	return ret;} static void ftrtc010_rtc_remove(struct platform_device *pdev){	struct ftrtc010_rtc *rtc = platform_get_drvdata(pdev); 	if (!IS_ERR(rtc->extclk))		clk_disable_unprepare(rtc->extclk);	if (!IS_ERR(rtc->pclk))		clk_disable_unprepare(rtc->pclk);} static const struct of_device_id ftrtc010_rtc_dt_match[] = {	{ .compatible = "cortina,gemini-rtc" },	{ .compatible = "faraday,ftrtc010" },	{ }};MODULE_DEVICE_TABLE(of, ftrtc010_rtc_dt_match); static struct platform_driver ftrtc010_rtc_driver = {	.driver		= {		.name	= DRV_NAME,		.of_match_table = ftrtc010_rtc_dt_match,	},	.probe		= ftrtc010_rtc_probe,	.remove		= ftrtc010_rtc_remove,}; module_platform_driver_probe(ftrtc010_rtc_driver, ftrtc010_rtc_probe);