drivers/rtc/rtc-stmp3xxx.c - kernel/skids - Git at Google

 /*
  * Freescale STMP37XX/STMP378X Real Time Clock driver
  *
  * Copyright (c) 2007 Sigmatel, Inc.
  * Peter Hartley, <peter.hartley@sigmatel.com>
  *
  * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
  * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
  */

 /*
  * The code contained herein is licensed under the GNU General Public
  * License. You may obtain a copy of the GNU General Public License
  * Version 2 or later at the following locations:
  *
  * http://www.opensource.org/licenses/gpl-license.html
  * http://www.gnu.org/copyleft/gpl.html
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/rtc.h>
 #include <linux/slab.h>

 #include <mach/platform.h>
 #include <mach/stmp3xxx.h>
 #include <mach/regs-rtc.h>

 struct stmp3xxx_rtc_data {
 	struct rtc_device *rtc;
 	unsigned irq_count;
 	void __iomem *io;
 	int irq_alarm, irq_1msec;
 };

 static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data)
 {
 	/*
 	 * The datasheet doesn't say which way round the
 	 * NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0,
 	 * 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS
 	 */
 	while (__raw_readl(rtc_data->io + HW_RTC_STAT) &
 			BF(0x80, RTC_STAT_STALE_REGS))
 		cpu_relax();
 }

 /* Time read/write */
 static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 {
 	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

 	stmp3xxx_wait_time(rtc_data);
 	rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_SECONDS), rtc_tm);
 	return 0;
 }

 static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t)
 {
 	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

 	__raw_writel(t, rtc_data->io + HW_RTC_SECONDS);
 	stmp3xxx_wait_time(rtc_data);
 	return 0;
 }

 /* interrupt(s) handler */
 static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id)
 {
 	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id);
 	u32 status;
 	u32 events = 0;

 	status = __raw_readl(rtc_data->io + HW_RTC_CTRL) &
 			(BM_RTC_CTRL_ALARM_IRQ | BM_RTC_CTRL_ONEMSEC_IRQ);

 	if (status & BM_RTC_CTRL_ALARM_IRQ) {
 		stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ,
 				rtc_data->io + HW_RTC_CTRL);
 		events |= RTC_AF | RTC_IRQF;
 	}

 	if (status & BM_RTC_CTRL_ONEMSEC_IRQ) {
 		stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ,
 				rtc_data->io + HW_RTC_CTRL);
 		if (++rtc_data->irq_count % 1000 == 0) {
 			events |= RTC_UF | RTC_IRQF;
 			rtc_data->irq_count = 0;
 		}
 	}

 	if (events)
 		rtc_update_irq(rtc_data->rtc, 1, events);

 	return IRQ_HANDLED;
 }

 static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
 	void __iomem *p = rtc_data->io + HW_RTC_PERSISTENT0,
 		     *ctl = rtc_data->io + HW_RTC_CTRL;

 	if (enabled) {
 		stmp3xxx_setl(BM_RTC_PERSISTENT0_ALARM_EN |
 			      BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
 		stmp3xxx_setl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
 	} else {
 		stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
 			      BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
 		stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
 	}
 	return 0;
 }

 static int stmp3xxx_update_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

 	if (enabled)
 		stmp3xxx_setl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
 				rtc_data->io + HW_RTC_CTRL);
 	else
 		stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
 				rtc_data->io + HW_RTC_CTRL);
 	return 0;
 }

 static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
 {
 	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

 	rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_ALARM), &alm->time);
 	return 0;
 }

 static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 {
 	unsigned long t;
 	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

 	rtc_tm_to_time(&alm->time, &t);
 	__raw_writel(t, rtc_data->io + HW_RTC_ALARM);
 	return 0;
 }

 static struct rtc_class_ops stmp3xxx_rtc_ops = {
 	.alarm_irq_enable =
 			  stmp3xxx_alarm_irq_enable,
 	.update_irq_enable =
 			  stmp3xxx_update_irq_enable,
 	.read_time	= stmp3xxx_rtc_gettime,
 	.set_mmss	= stmp3xxx_rtc_set_mmss,
 	.read_alarm	= stmp3xxx_rtc_read_alarm,
 	.set_alarm	= stmp3xxx_rtc_set_alarm,
 };

 static int stmp3xxx_rtc_remove(struct platform_device *pdev)
 {
 	struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev);

 	if (!rtc_data)
 		return 0;

 	stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN,
 			rtc_data->io + HW_RTC_CTRL);
 	free_irq(rtc_data->irq_alarm, &pdev->dev);
 	free_irq(rtc_data->irq_1msec, &pdev->dev);
 	rtc_device_unregister(rtc_data->rtc);
 	iounmap(rtc_data->io);
 	kfree(rtc_data);

 	return 0;
 }

 static int stmp3xxx_rtc_probe(struct platform_device *pdev)
 {
 	struct stmp3xxx_rtc_data *rtc_data;
 	struct resource *r;
 	int err;

 	rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL);
 	if (!rtc_data)
 		return -ENOMEM;

 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r) {
 		dev_err(&pdev->dev, "failed to get resource\n");
 		err = -ENXIO;
 		goto out_free;
 	}

 	rtc_data->io = ioremap(r->start, resource_size(r));
 	if (!rtc_data->io) {
 		dev_err(&pdev->dev, "ioremap failed\n");
 		err = -EIO;
 		goto out_free;
 	}

 	rtc_data->irq_alarm = platform_get_irq(pdev, 0);
 	rtc_data->irq_1msec = platform_get_irq(pdev, 1);

 	if (!(__raw_readl(HW_RTC_STAT + rtc_data->io) &
 			BM_RTC_STAT_RTC_PRESENT)) {
 		dev_err(&pdev->dev, "no device onboard\n");
 		err = -ENODEV;
 		goto out_remap;
 	}

 	stmp3xxx_reset_block(rtc_data->io, true);
 	stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
 			BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
 			BM_RTC_PERSISTENT0_ALARM_WAKE,
 			rtc_data->io + HW_RTC_PERSISTENT0);
 	rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev,
 				&stmp3xxx_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc_data->rtc)) {
 		err = PTR_ERR(rtc_data->rtc);
 		goto out_remap;
 	}

 	rtc_data->irq_count = 0;
 	err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt,
 			IRQF_DISABLED, "RTC alarm", &pdev->dev);
 	if (err) {
 		dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
 			rtc_data->irq_alarm);
 		goto out_irq_alarm;
 	}
 	err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt,
 			IRQF_DISABLED, "RTC tick", &pdev->dev);
 	if (err) {
 		dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
 			rtc_data->irq_1msec);
 		goto out_irq1;
 	}

 	platform_set_drvdata(pdev, rtc_data);

 	return 0;

 out_irq1:
 	free_irq(rtc_data->irq_alarm, &pdev->dev);
 out_irq_alarm:
 	stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN,
 			rtc_data->io + HW_RTC_CTRL);
 	rtc_device_unregister(rtc_data->rtc);
 out_remap:
 	iounmap(rtc_data->io);
 out_free:
 	kfree(rtc_data);
 	return err;
 }

 #ifdef CONFIG_PM
 static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state)
 {
 	return 0;
 }

 static int stmp3xxx_rtc_resume(struct platform_device *dev)
 {
 	struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev);

 	stmp3xxx_reset_block(rtc_data->io, true);
 	stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
 			BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
 			BM_RTC_PERSISTENT0_ALARM_WAKE,
 			rtc_data->io + HW_RTC_PERSISTENT0);
 	return 0;
 }
 #else
 #define stmp3xxx_rtc_suspend	NULL
 #define stmp3xxx_rtc_resume	NULL
 #endif

 static struct platform_driver stmp3xxx_rtcdrv = {
 	.probe		= stmp3xxx_rtc_probe,
 	.remove		= stmp3xxx_rtc_remove,
 	.suspend	= stmp3xxx_rtc_suspend,
 	.resume		= stmp3xxx_rtc_resume,
 	.driver		= {
 		.name	= "stmp3xxx-rtc",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init stmp3xxx_rtc_init(void)
 {
 	return platform_driver_register(&stmp3xxx_rtcdrv);
 }

 static void __exit stmp3xxx_rtc_exit(void)
 {
 	platform_driver_unregister(&stmp3xxx_rtcdrv);
 }

 module_init(stmp3xxx_rtc_init);
 module_exit(stmp3xxx_rtc_exit);

 MODULE_DESCRIPTION("STMP3xxx RTC Driver");
 MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>");
 MODULE_LICENSE("GPL");
	/*
	* Freescale STMP37XX/STMP378X Real Time Clock driver
	*
	* Copyright (c) 2007 Sigmatel, Inc.
	* Peter Hartley, <peter.hartley@sigmatel.com>
	*
	* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
	* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
	*/

	/*
	* The code contained herein is licensed under the GNU General Public
	* License. You may obtain a copy of the GNU General Public License
	* Version 2 or later at the following locations:
	*
	* http://www.opensource.org/licenses/gpl-license.html
	* http://www.gnu.org/copyleft/gpl.html
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/rtc.h>
	#include <linux/slab.h>

	#include <mach/platform.h>
	#include <mach/stmp3xxx.h>
	#include <mach/regs-rtc.h>

	struct stmp3xxx_rtc_data {
	struct rtc_device *rtc;
	unsigned irq_count;
	void __iomem *io;
	int irq_alarm, irq_1msec;
	};

	static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data)
	{
	/*
	* The datasheet doesn't say which way round the
	* NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0,
	* 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS
	*/
	while (__raw_readl(rtc_data->io + HW_RTC_STAT) &
	BF(0x80, RTC_STAT_STALE_REGS))
	cpu_relax();
	}

	/* Time read/write */
	static int stmp3xxx_rtc_gettime(struct device dev, struct rtc_time rtc_tm)
	{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

	stmp3xxx_wait_time(rtc_data);
	rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_SECONDS), rtc_tm);
	return 0;
	}

	static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t)
	{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

	__raw_writel(t, rtc_data->io + HW_RTC_SECONDS);
	stmp3xxx_wait_time(rtc_data);
	return 0;
	}

	/* interrupt(s) handler */
	static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id)
	{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id);
	u32 status;
	u32 events = 0;

	status = __raw_readl(rtc_data->io + HW_RTC_CTRL) &
	(BM_RTC_CTRL_ALARM_IRQ \| BM_RTC_CTRL_ONEMSEC_IRQ);

	if (status & BM_RTC_CTRL_ALARM_IRQ) {
	stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ,
	rtc_data->io + HW_RTC_CTRL);
	events \|= RTC_AF \| RTC_IRQF;
	}

	if (status & BM_RTC_CTRL_ONEMSEC_IRQ) {
	stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ,
	rtc_data->io + HW_RTC_CTRL);
	if (++rtc_data->irq_count % 1000 == 0) {
	events \|= RTC_UF \| RTC_IRQF;
	rtc_data->irq_count = 0;
	}
	}

	if (events)
	rtc_update_irq(rtc_data->rtc, 1, events);

	return IRQ_HANDLED;
	}

	static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled)
	{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
	void __iomem *p = rtc_data->io + HW_RTC_PERSISTENT0,
	*ctl = rtc_data->io + HW_RTC_CTRL;

	if (enabled) {
	stmp3xxx_setl(BM_RTC_PERSISTENT0_ALARM_EN \|
	BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
	stmp3xxx_setl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
	} else {
	stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN \|
	BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
	stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
	}
	return 0;
	}

	static int stmp3xxx_update_irq_enable(struct device *dev, unsigned int enabled)
	{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

	if (enabled)
	stmp3xxx_setl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
	rtc_data->io + HW_RTC_CTRL);
	else
	stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
	rtc_data->io + HW_RTC_CTRL);
	return 0;
	}

	static int stmp3xxx_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

	rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_ALARM), &alm->time);
	return 0;
	}

	static int stmp3xxx_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	{
	unsigned long t;
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

	rtc_tm_to_time(&alm->time, &t);
	__raw_writel(t, rtc_data->io + HW_RTC_ALARM);
	return 0;
	}

	static struct rtc_class_ops stmp3xxx_rtc_ops = {
	.alarm_irq_enable =
	stmp3xxx_alarm_irq_enable,
	.update_irq_enable =
	stmp3xxx_update_irq_enable,
	.read_time = stmp3xxx_rtc_gettime,
	.set_mmss = stmp3xxx_rtc_set_mmss,
	.read_alarm = stmp3xxx_rtc_read_alarm,
	.set_alarm = stmp3xxx_rtc_set_alarm,
	};

	static int stmp3xxx_rtc_remove(struct platform_device *pdev)
	{
	struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev);

	if (!rtc_data)
	return 0;

	stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN \| BM_RTC_CTRL_ALARM_IRQ_EN,
	rtc_data->io + HW_RTC_CTRL);
	free_irq(rtc_data->irq_alarm, &pdev->dev);
	free_irq(rtc_data->irq_1msec, &pdev->dev);
	rtc_device_unregister(rtc_data->rtc);
	iounmap(rtc_data->io);
	kfree(rtc_data);

	return 0;
	}

	static int stmp3xxx_rtc_probe(struct platform_device *pdev)
	{
	struct stmp3xxx_rtc_data *rtc_data;
	struct resource *r;
	int err;

	rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL);
	if (!rtc_data)
	return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
	dev_err(&pdev->dev, "failed to get resource\n");
	err = -ENXIO;
	goto out_free;
	}

	rtc_data->io = ioremap(r->start, resource_size(r));
	if (!rtc_data->io) {
	dev_err(&pdev->dev, "ioremap failed\n");
	err = -EIO;
	goto out_free;
	}

	rtc_data->irq_alarm = platform_get_irq(pdev, 0);
	rtc_data->irq_1msec = platform_get_irq(pdev, 1);

	if (!(__raw_readl(HW_RTC_STAT + rtc_data->io) &
	BM_RTC_STAT_RTC_PRESENT)) {
	dev_err(&pdev->dev, "no device onboard\n");
	err = -ENODEV;
	goto out_remap;
	}

	stmp3xxx_reset_block(rtc_data->io, true);
	stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN \|
	BM_RTC_PERSISTENT0_ALARM_WAKE_EN \|
	BM_RTC_PERSISTENT0_ALARM_WAKE,
	rtc_data->io + HW_RTC_PERSISTENT0);
	rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev,
	&stmp3xxx_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc_data->rtc)) {
	err = PTR_ERR(rtc_data->rtc);
	goto out_remap;
	}

	rtc_data->irq_count = 0;
	err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt,
	IRQF_DISABLED, "RTC alarm", &pdev->dev);
	if (err) {
	dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
	rtc_data->irq_alarm);
	goto out_irq_alarm;
	}
	err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt,
	IRQF_DISABLED, "RTC tick", &pdev->dev);
	if (err) {
	dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
	rtc_data->irq_1msec);
	goto out_irq1;
	}

	platform_set_drvdata(pdev, rtc_data);

	return 0;

	out_irq1:
	free_irq(rtc_data->irq_alarm, &pdev->dev);
	out_irq_alarm:
	stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN \| BM_RTC_CTRL_ALARM_IRQ_EN,
	rtc_data->io + HW_RTC_CTRL);
	rtc_device_unregister(rtc_data->rtc);
	out_remap:
	iounmap(rtc_data->io);
	out_free:
	kfree(rtc_data);
	return err;
	}

	#ifdef CONFIG_PM
	static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state)
	{
	return 0;
	}

	static int stmp3xxx_rtc_resume(struct platform_device *dev)
	{
	struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev);

	stmp3xxx_reset_block(rtc_data->io, true);
	stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN \|
	BM_RTC_PERSISTENT0_ALARM_WAKE_EN \|
	BM_RTC_PERSISTENT0_ALARM_WAKE,
	rtc_data->io + HW_RTC_PERSISTENT0);
	return 0;
	}
	#else
	#define stmp3xxx_rtc_suspend NULL
	#define stmp3xxx_rtc_resume NULL
	#endif

	static struct platform_driver stmp3xxx_rtcdrv = {
	.probe = stmp3xxx_rtc_probe,
	.remove = stmp3xxx_rtc_remove,
	.suspend = stmp3xxx_rtc_suspend,
	.resume = stmp3xxx_rtc_resume,
	.driver = {
	.name = "stmp3xxx-rtc",
	.owner = THIS_MODULE,
	},
	};

	static int __init stmp3xxx_rtc_init(void)
	{
	return platform_driver_register(&stmp3xxx_rtcdrv);
	}

	static void __exit stmp3xxx_rtc_exit(void)
	{
	platform_driver_unregister(&stmp3xxx_rtcdrv);
	}

	module_init(stmp3xxx_rtc_init);
	module_exit(stmp3xxx_rtc_exit);

	MODULE_DESCRIPTION("STMP3xxx RTC Driver");
	MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>");
	MODULE_LICENSE("GPL");