drivers/rtc/rtc-puv3.c - maze/linux - Git at Google

 /*
  * RTC driver code specific to PKUnity SoC and UniCore ISA
  *
  *	Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
  *	Copyright (C) 2001-2010 Guan Xuetao
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/string.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/rtc.h>
 #include <linux/bcd.h>
 #include <linux/clk.h>
 #include <linux/log2.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>

 #include <asm/irq.h>
 #include <mach/hardware.h>

 static struct resource *puv3_rtc_mem;

 static int puv3_rtc_alarmno = IRQ_RTCAlarm;
 static int puv3_rtc_tickno  = IRQ_RTC;

 static DEFINE_SPINLOCK(puv3_rtc_pie_lock);

 /* IRQ Handlers */
 static irqreturn_t puv3_rtc_alarmirq(int irq, void *id)
 {
 	struct rtc_device *rdev = id;

 	writel(readl(RTC_RTSR) | RTC_RTSR_AL, RTC_RTSR);
 	rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
 	return IRQ_HANDLED;
 }

 static irqreturn_t puv3_rtc_tickirq(int irq, void *id)
 {
 	struct rtc_device *rdev = id;

 	writel(readl(RTC_RTSR) | RTC_RTSR_HZ, RTC_RTSR);
 	rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
 	return IRQ_HANDLED;
 }

 /* Update control registers */
 static void puv3_rtc_setaie(int to)
 {
 	unsigned int tmp;

 	pr_debug("%s: aie=%d\n", __func__, to);

 	tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE;

 	if (to)
 		tmp |= RTC_RTSR_ALE;

 	writel(tmp, RTC_RTSR);
 }

 static int puv3_rtc_setpie(struct device *dev, int enabled)
 {
 	unsigned int tmp;

 	pr_debug("%s: pie=%d\n", __func__, enabled);

 	spin_lock_irq(&puv3_rtc_pie_lock);
 	tmp = readl(RTC_RTSR) & ~RTC_RTSR_HZE;

 	if (enabled)
 		tmp |= RTC_RTSR_HZE;

 	writel(tmp, RTC_RTSR);
 	spin_unlock_irq(&puv3_rtc_pie_lock);

 	return 0;
 }

 /* Time read/write */
 static int puv3_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 {
 	rtc_time_to_tm(readl(RTC_RCNR), rtc_tm);

 	pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
 		 rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
 		 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);

 	return 0;
 }

 static int puv3_rtc_settime(struct device *dev, struct rtc_time *tm)
 {
 	unsigned long rtc_count = 0;

 	pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
 		 tm->tm_year, tm->tm_mon, tm->tm_mday,
 		 tm->tm_hour, tm->tm_min, tm->tm_sec);

 	rtc_tm_to_time(tm, &rtc_count);
 	writel(rtc_count, RTC_RCNR);

 	return 0;
 }

 static int puv3_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct rtc_time *alm_tm = &alrm->time;

 	rtc_time_to_tm(readl(RTC_RTAR), alm_tm);

 	alrm->enabled = readl(RTC_RTSR) & RTC_RTSR_ALE;

 	pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
 		 alrm->enabled,
 		 alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
 		 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);

 	return 0;
 }

 static int puv3_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct rtc_time *tm = &alrm->time;
 	unsigned long rtcalarm_count = 0;

 	pr_debug("puv3_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
 		 alrm->enabled,
 		 tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
 		 tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);

 	rtc_tm_to_time(tm, &rtcalarm_count);
 	writel(rtcalarm_count, RTC_RTAR);

 	puv3_rtc_setaie(alrm->enabled);

 	if (alrm->enabled)
 		enable_irq_wake(puv3_rtc_alarmno);
 	else
 		disable_irq_wake(puv3_rtc_alarmno);

 	return 0;
 }

 static int puv3_rtc_proc(struct device *dev, struct seq_file *seq)
 {
 	seq_printf(seq, "periodic_IRQ\t: %s\n",
 		     (readl(RTC_RTSR) & RTC_RTSR_HZE) ? "yes" : "no");
 	return 0;
 }

 static int puv3_rtc_open(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
 	int ret;

 	ret = request_irq(puv3_rtc_alarmno, puv3_rtc_alarmirq,
 			0, "pkunity-rtc alarm", rtc_dev);

 	if (ret) {
 		dev_err(dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret);
 		return ret;
 	}

 	ret = request_irq(puv3_rtc_tickno, puv3_rtc_tickirq,
 			0, "pkunity-rtc tick", rtc_dev);

 	if (ret) {
 		dev_err(dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret);
 		goto tick_err;
 	}

 	return ret;

  tick_err:
 	free_irq(puv3_rtc_alarmno, rtc_dev);
 	return ret;
 }

 static void puv3_rtc_release(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);

 	/* do not clear AIE here, it may be needed for wake */
 	puv3_rtc_setpie(dev, 0);
 	free_irq(puv3_rtc_alarmno, rtc_dev);
 	free_irq(puv3_rtc_tickno, rtc_dev);
 }

 static const struct rtc_class_ops puv3_rtcops = {
 	.open		= puv3_rtc_open,
 	.release	= puv3_rtc_release,
 	.read_time	= puv3_rtc_gettime,
 	.set_time	= puv3_rtc_settime,
 	.read_alarm	= puv3_rtc_getalarm,
 	.set_alarm	= puv3_rtc_setalarm,
 	.proc	        = puv3_rtc_proc,
 };

 static void puv3_rtc_enable(struct platform_device *pdev, int en)
 {
 	if (!en) {
 		writel(readl(RTC_RTSR) & ~RTC_RTSR_HZE, RTC_RTSR);
 	} else {
 		/* re-enable the device, and check it is ok */
 		if ((readl(RTC_RTSR) & RTC_RTSR_HZE) == 0) {
 			dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
 			writel(readl(RTC_RTSR) | RTC_RTSR_HZE, RTC_RTSR);
 		}
 	}
 }

 static int __devexit puv3_rtc_remove(struct platform_device *dev)
 {
 	struct rtc_device *rtc = platform_get_drvdata(dev);

 	platform_set_drvdata(dev, NULL);
 	rtc_device_unregister(rtc);

 	puv3_rtc_setpie(&dev->dev, 0);
 	puv3_rtc_setaie(0);

 	release_resource(puv3_rtc_mem);
 	kfree(puv3_rtc_mem);

 	return 0;
 }

 static int __devinit puv3_rtc_probe(struct platform_device *pdev)
 {
 	struct rtc_device *rtc;
 	struct resource *res;
 	int ret;

 	pr_debug("%s: probe=%p\n", __func__, pdev);

 	/* find the IRQs */
 	puv3_rtc_tickno = platform_get_irq(pdev, 1);
 	if (puv3_rtc_tickno < 0) {
 		dev_err(&pdev->dev, "no irq for rtc tick\n");
 		return -ENOENT;
 	}

 	puv3_rtc_alarmno = platform_get_irq(pdev, 0);
 	if (puv3_rtc_alarmno < 0) {
 		dev_err(&pdev->dev, "no irq for alarm\n");
 		return -ENOENT;
 	}

 	pr_debug("PKUnity_rtc: tick irq %d, alarm irq %d\n",
 		 puv3_rtc_tickno, puv3_rtc_alarmno);

 	/* get the memory region */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "failed to get memory region resource\n");
 		return -ENOENT;
 	}

 	puv3_rtc_mem = request_mem_region(res->start, resource_size(res),
 					  pdev->name);

 	if (puv3_rtc_mem == NULL) {
 		dev_err(&pdev->dev, "failed to reserve memory region\n");
 		ret = -ENOENT;
 		goto err_nores;
 	}

 	puv3_rtc_enable(pdev, 1);

 	/* register RTC and exit */
 	rtc = rtc_device_register("pkunity", &pdev->dev, &puv3_rtcops,
 				  THIS_MODULE);

 	if (IS_ERR(rtc)) {
 		dev_err(&pdev->dev, "cannot attach rtc\n");
 		ret = PTR_ERR(rtc);
 		goto err_nortc;
 	}

 	/* platform setup code should have handled this; sigh */
 	if (!device_can_wakeup(&pdev->dev))
 		device_init_wakeup(&pdev->dev, 1);

 	platform_set_drvdata(pdev, rtc);
 	return 0;

  err_nortc:
 	puv3_rtc_enable(pdev, 0);
 	release_resource(puv3_rtc_mem);

  err_nores:
 	return ret;
 }

 #ifdef CONFIG_PM

 static int ticnt_save;

 static int puv3_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	/* save RTAR for anyone using periodic interrupts */
 	ticnt_save = readl(RTC_RTAR);
 	puv3_rtc_enable(pdev, 0);
 	return 0;
 }

 static int puv3_rtc_resume(struct platform_device *pdev)
 {
 	puv3_rtc_enable(pdev, 1);
 	writel(ticnt_save, RTC_RTAR);
 	return 0;
 }
 #else
 #define puv3_rtc_suspend NULL
 #define puv3_rtc_resume  NULL
 #endif

 static struct platform_driver puv3_rtc_driver = {
 	.probe		= puv3_rtc_probe,
 	.remove		= __devexit_p(puv3_rtc_remove),
 	.suspend	= puv3_rtc_suspend,
 	.resume		= puv3_rtc_resume,
 	.driver		= {
 		.name	= "PKUnity-v3-RTC",
 		.owner	= THIS_MODULE,
 	}
 };

 module_platform_driver(puv3_rtc_driver);

 MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
 MODULE_AUTHOR("Hu Dongliang");
 MODULE_LICENSE("GPL v2");
	/*
	* RTC driver code specific to PKUnity SoC and UniCore ISA
	*
	* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
	* Copyright (C) 2001-2010 Guan Xuetao
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/module.h>
	#include <linux/fs.h>
	#include <linux/string.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/rtc.h>
	#include <linux/bcd.h>
	#include <linux/clk.h>
	#include <linux/log2.h>
	#include <linux/slab.h>
	#include <linux/uaccess.h>
	#include <linux/io.h>

	#include <asm/irq.h>
	#include <mach/hardware.h>

	static struct resource *puv3_rtc_mem;

	static int puv3_rtc_alarmno = IRQ_RTCAlarm;
	static int puv3_rtc_tickno = IRQ_RTC;

	static DEFINE_SPINLOCK(puv3_rtc_pie_lock);

	/* IRQ Handlers */
	static irqreturn_t puv3_rtc_alarmirq(int irq, void *id)
	{
	struct rtc_device *rdev = id;

	writel(readl(RTC_RTSR) \| RTC_RTSR_AL, RTC_RTSR);
	rtc_update_irq(rdev, 1, RTC_AF \| RTC_IRQF);
	return IRQ_HANDLED;
	}

	static irqreturn_t puv3_rtc_tickirq(int irq, void *id)
	{
	struct rtc_device *rdev = id;

	writel(readl(RTC_RTSR) \| RTC_RTSR_HZ, RTC_RTSR);
	rtc_update_irq(rdev, 1, RTC_PF \| RTC_IRQF);
	return IRQ_HANDLED;
	}

	/* Update control registers */
	static void puv3_rtc_setaie(int to)
	{
	unsigned int tmp;

	pr_debug("%s: aie=%d\n", __func__, to);

	tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE;

	if (to)
	tmp \|= RTC_RTSR_ALE;

	writel(tmp, RTC_RTSR);
	}

	static int puv3_rtc_setpie(struct device *dev, int enabled)
	{
	unsigned int tmp;

	pr_debug("%s: pie=%d\n", __func__, enabled);

	spin_lock_irq(&puv3_rtc_pie_lock);
	tmp = readl(RTC_RTSR) & ~RTC_RTSR_HZE;

	if (enabled)
	tmp \|= RTC_RTSR_HZE;

	writel(tmp, RTC_RTSR);
	spin_unlock_irq(&puv3_rtc_pie_lock);

	return 0;
	}

	/* Time read/write */
	static int puv3_rtc_gettime(struct device dev, struct rtc_time rtc_tm)
	{
	rtc_time_to_tm(readl(RTC_RCNR), rtc_tm);

	pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
	rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
	rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);

	return 0;
	}

	static int puv3_rtc_settime(struct device dev, struct rtc_time tm)
	{
	unsigned long rtc_count = 0;

	pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
	tm->tm_year, tm->tm_mon, tm->tm_mday,
	tm->tm_hour, tm->tm_min, tm->tm_sec);

	rtc_tm_to_time(tm, &rtc_count);
	writel(rtc_count, RTC_RCNR);

	return 0;
	}

	static int puv3_rtc_getalarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct rtc_time *alm_tm = &alrm->time;

	rtc_time_to_tm(readl(RTC_RTAR), alm_tm);

	alrm->enabled = readl(RTC_RTSR) & RTC_RTSR_ALE;

	pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
	alrm->enabled,
	alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
	alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);

	return 0;
	}

	static int puv3_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct rtc_time *tm = &alrm->time;
	unsigned long rtcalarm_count = 0;

	pr_debug("puv3_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
	alrm->enabled,
	tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
	tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);

	rtc_tm_to_time(tm, &rtcalarm_count);
	writel(rtcalarm_count, RTC_RTAR);

	puv3_rtc_setaie(alrm->enabled);

	if (alrm->enabled)
	enable_irq_wake(puv3_rtc_alarmno);
	else
	disable_irq_wake(puv3_rtc_alarmno);

	return 0;
	}

	static int puv3_rtc_proc(struct device dev, struct seq_file seq)
	{
	seq_printf(seq, "periodic_IRQ\t: %s\n",
	(readl(RTC_RTSR) & RTC_RTSR_HZE) ? "yes" : "no");
	return 0;
	}

	static int puv3_rtc_open(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
	int ret;

	ret = request_irq(puv3_rtc_alarmno, puv3_rtc_alarmirq,
	0, "pkunity-rtc alarm", rtc_dev);

	if (ret) {
	dev_err(dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret);
	return ret;
	}

	ret = request_irq(puv3_rtc_tickno, puv3_rtc_tickirq,
	0, "pkunity-rtc tick", rtc_dev);

	if (ret) {
	dev_err(dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret);
	goto tick_err;
	}

	return ret;

	tick_err:
	free_irq(puv3_rtc_alarmno, rtc_dev);
	return ret;
	}

	static void puv3_rtc_release(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);

	/* do not clear AIE here, it may be needed for wake */
	puv3_rtc_setpie(dev, 0);
	free_irq(puv3_rtc_alarmno, rtc_dev);
	free_irq(puv3_rtc_tickno, rtc_dev);
	}

	static const struct rtc_class_ops puv3_rtcops = {
	.open = puv3_rtc_open,
	.release = puv3_rtc_release,
	.read_time = puv3_rtc_gettime,
	.set_time = puv3_rtc_settime,
	.read_alarm = puv3_rtc_getalarm,
	.set_alarm = puv3_rtc_setalarm,
	.proc = puv3_rtc_proc,
	};

	static void puv3_rtc_enable(struct platform_device *pdev, int en)
	{
	if (!en) {
	writel(readl(RTC_RTSR) & ~RTC_RTSR_HZE, RTC_RTSR);
	} else {
	/* re-enable the device, and check it is ok */
	if ((readl(RTC_RTSR) & RTC_RTSR_HZE) == 0) {
	dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
	writel(readl(RTC_RTSR) \| RTC_RTSR_HZE, RTC_RTSR);
	}
	}
	}

	static int __devexit puv3_rtc_remove(struct platform_device *dev)
	{
	struct rtc_device *rtc = platform_get_drvdata(dev);

	platform_set_drvdata(dev, NULL);
	rtc_device_unregister(rtc);

	puv3_rtc_setpie(&dev->dev, 0);
	puv3_rtc_setaie(0);

	release_resource(puv3_rtc_mem);
	kfree(puv3_rtc_mem);

	return 0;
	}

	static int __devinit puv3_rtc_probe(struct platform_device *pdev)
	{
	struct rtc_device *rtc;
	struct resource *res;
	int ret;

	pr_debug("%s: probe=%p\n", __func__, pdev);

	/* find the IRQs */
	puv3_rtc_tickno = platform_get_irq(pdev, 1);
	if (puv3_rtc_tickno < 0) {
	dev_err(&pdev->dev, "no irq for rtc tick\n");
	return -ENOENT;
	}

	puv3_rtc_alarmno = platform_get_irq(pdev, 0);
	if (puv3_rtc_alarmno < 0) {
	dev_err(&pdev->dev, "no irq for alarm\n");
	return -ENOENT;
	}

	pr_debug("PKUnity_rtc: tick irq %d, alarm irq %d\n",
	puv3_rtc_tickno, puv3_rtc_alarmno);

	/* get the memory region */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "failed to get memory region resource\n");
	return -ENOENT;
	}

	puv3_rtc_mem = request_mem_region(res->start, resource_size(res),
	pdev->name);

	if (puv3_rtc_mem == NULL) {
	dev_err(&pdev->dev, "failed to reserve memory region\n");
	ret = -ENOENT;
	goto err_nores;
	}

	puv3_rtc_enable(pdev, 1);

	/* register RTC and exit */
	rtc = rtc_device_register("pkunity", &pdev->dev, &puv3_rtcops,
	THIS_MODULE);

	if (IS_ERR(rtc)) {
	dev_err(&pdev->dev, "cannot attach rtc\n");
	ret = PTR_ERR(rtc);
	goto err_nortc;
	}

	/* platform setup code should have handled this; sigh */
	if (!device_can_wakeup(&pdev->dev))
	device_init_wakeup(&pdev->dev, 1);

	platform_set_drvdata(pdev, rtc);
	return 0;

	err_nortc:
	puv3_rtc_enable(pdev, 0);
	release_resource(puv3_rtc_mem);

	err_nores:
	return ret;
	}

	#ifdef CONFIG_PM

	static int ticnt_save;

	static int puv3_rtc_suspend(struct platform_device *pdev, pm_message_t state)
	{
	/* save RTAR for anyone using periodic interrupts */
	ticnt_save = readl(RTC_RTAR);
	puv3_rtc_enable(pdev, 0);
	return 0;
	}

	static int puv3_rtc_resume(struct platform_device *pdev)
	{
	puv3_rtc_enable(pdev, 1);
	writel(ticnt_save, RTC_RTAR);
	return 0;
	}
	#else
	#define puv3_rtc_suspend NULL
	#define puv3_rtc_resume NULL
	#endif

	static struct platform_driver puv3_rtc_driver = {
	.probe = puv3_rtc_probe,
	.remove = __devexit_p(puv3_rtc_remove),
	.suspend = puv3_rtc_suspend,
	.resume = puv3_rtc_resume,
	.driver = {
	.name = "PKUnity-v3-RTC",
	.owner = THIS_MODULE,
	}
	};

	module_platform_driver(puv3_rtc_driver);

	MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
	MODULE_AUTHOR("Hu Dongliang");
	MODULE_LICENSE("GPL v2");