[linux-2.6-block.git] / drivers / rtc / rtc-s3c.c

/* drivers/rtc/rtc-s3c.c
 *
 * Copyright (c) 2004,2006 Simtec Electronics
 *	Ben Dooks, <ben@simtec.co.uk>
 *	http://armlinux.simtec.co.uk/
 *
 * 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.
 *
 * S3C2410/S3C2440/S3C24XX Internal RTC Driver
*/

#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 <mach/hardware.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <plat/regs-rtc.h>

/* I have yet to find an S3C implementation with more than one
 * of these rtc blocks in */

static struct resource *s3c_rtc_mem;

static void __iomem *s3c_rtc_base;
static int s3c_rtc_alarmno = NO_IRQ;
static int s3c_rtc_tickno  = NO_IRQ;

static DEFINE_SPINLOCK(s3c_rtc_pie_lock);

/* IRQ Handlers */

static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
{
	struct rtc_device *rdev = id;

	rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
	return IRQ_HANDLED;
}

static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
{
	struct rtc_device *rdev = id;

	rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
	return IRQ_HANDLED;
}

/* Update control registers */
static void s3c_rtc_setaie(int to)
{
	unsigned int tmp;

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

	tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;

	if (to)
		tmp |= S3C2410_RTCALM_ALMEN;

	writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
}

static int s3c_rtc_setpie(struct device *dev, int enabled)
{
	unsigned int tmp;

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

	spin_lock_irq(&s3c_rtc_pie_lock);
	tmp = readb(s3c_rtc_base + S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;

	if (enabled)
		tmp |= S3C2410_TICNT_ENABLE;

	writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
	spin_unlock_irq(&s3c_rtc_pie_lock);

	return 0;
}

static int s3c_rtc_setfreq(struct device *dev, int freq)
{
	unsigned int tmp;

	if (!is_power_of_2(freq))
		return -EINVAL;

	spin_lock_irq(&s3c_rtc_pie_lock);

	tmp = readb(s3c_rtc_base + S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
	tmp |= (128 / freq)-1;

	writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
	spin_unlock_irq(&s3c_rtc_pie_lock);

	return 0;
}

/* Time read/write */

static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
	unsigned int have_retried = 0;
	void __iomem *base = s3c_rtc_base;

 retry_get_time:
	rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
	rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
	rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
	rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
	rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
	rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);

	/* the only way to work out wether the system was mid-update
	 * when we read it is to check the second counter, and if it
	 * is zero, then we re-try the entire read
	 */

	if (rtc_tm->tm_sec == 0 && !have_retried) {
		have_retried = 1;
		goto retry_get_time;
	}

	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);

	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);

	rtc_tm->tm_year += 100;
	rtc_tm->tm_mon -= 1;

	return 0;
}

static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
{
	void __iomem *base = s3c_rtc_base;
	int year = tm->tm_year - 100;

	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);

	/* we get around y2k by simply not supporting it */

	if (year < 0 || year >= 100) {
		dev_err(dev, "rtc only supports 100 years\n");
		return -EINVAL;
	}

	writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
	writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
	writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
	writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
	writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
	writeb(bin2bcd(year), base + S3C2410_RTCYEAR);

	return 0;
}

static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct rtc_time *alm_tm = &alrm->time;
	void __iomem *base = s3c_rtc_base;
	unsigned int alm_en;

	alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
	alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
	alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
	alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
	alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
	alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);

	alm_en = readb(base + S3C2410_RTCALM);

	alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;

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


	/* decode the alarm enable field */

	if (alm_en & S3C2410_RTCALM_SECEN)
		alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
	else
		alm_tm->tm_sec = 0xff;

	if (alm_en & S3C2410_RTCALM_MINEN)
		alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
	else
		alm_tm->tm_min = 0xff;

	if (alm_en & S3C2410_RTCALM_HOUREN)
		alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
	else
		alm_tm->tm_hour = 0xff;

	if (alm_en & S3C2410_RTCALM_DAYEN)
		alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
	else
		alm_tm->tm_mday = 0xff;

	if (alm_en & S3C2410_RTCALM_MONEN) {
		alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
		alm_tm->tm_mon -= 1;
	} else {
		alm_tm->tm_mon = 0xff;
	}

	if (alm_en & S3C2410_RTCALM_YEAREN)
		alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
	else
		alm_tm->tm_year = 0xffff;

	return 0;
}

static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct rtc_time *tm = &alrm->time;
	void __iomem *base = s3c_rtc_base;
	unsigned int alrm_en;

	pr_debug("s3c_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);


	alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
	writeb(0x00, base + S3C2410_RTCALM);

	if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
		alrm_en |= S3C2410_RTCALM_SECEN;
		writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
	}

	if (tm->tm_min < 60 && tm->tm_min >= 0) {
		alrm_en |= S3C2410_RTCALM_MINEN;
		writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
	}

	if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
		alrm_en |= S3C2410_RTCALM_HOUREN;
		writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
	}

	pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);

	writeb(alrm_en, base + S3C2410_RTCALM);

	s3c_rtc_setaie(alrm->enabled);

	if (alrm->enabled)
		enable_irq_wake(s3c_rtc_alarmno);
	else
		disable_irq_wake(s3c_rtc_alarmno);

	return 0;
}

static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
{
	unsigned int ticnt = readb(s3c_rtc_base + S3C2410_TICNT);

	seq_printf(seq, "periodic_IRQ\t: %s\n",
		     (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
	return 0;
}

static int s3c_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(s3c_rtc_alarmno, s3c_rtc_alarmirq,
			  IRQF_DISABLED,  "s3c2410-rtc alarm", rtc_dev);

	if (ret) {
		dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
		return ret;
	}

	ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
			  IRQF_DISABLED,  "s3c2410-rtc tick", rtc_dev);

	if (ret) {
		dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
		goto tick_err;
	}

	return ret;

 tick_err:
	free_irq(s3c_rtc_alarmno, rtc_dev);
	return ret;
}

static void s3c_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 */

	s3c_rtc_setpie(dev, 0);
	free_irq(s3c_rtc_alarmno, rtc_dev);
	free_irq(s3c_rtc_tickno, rtc_dev);
}

static const struct rtc_class_ops s3c_rtcops = {
	.open		= s3c_rtc_open,
	.release	= s3c_rtc_release,
	.read_time	= s3c_rtc_gettime,
	.set_time	= s3c_rtc_settime,
	.read_alarm	= s3c_rtc_getalarm,
	.set_alarm	= s3c_rtc_setalarm,
	.irq_set_freq	= s3c_rtc_setfreq,
	.irq_set_state	= s3c_rtc_setpie,
	.proc	        = s3c_rtc_proc,
};

static void s3c_rtc_enable(struct platform_device *pdev, int en)
{
	void __iomem *base = s3c_rtc_base;
	unsigned int tmp;

	if (s3c_rtc_base == NULL)
		return;

	if (!en) {
		tmp = readb(base + S3C2410_RTCCON);
		writeb(tmp & ~S3C2410_RTCCON_RTCEN, base + S3C2410_RTCCON);

		tmp = readb(base + S3C2410_TICNT);
		writeb(tmp & ~S3C2410_TICNT_ENABLE, base + S3C2410_TICNT);
	} else {
		/* re-enable the device, and check it is ok */

		if ((readb(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
			dev_info(&pdev->dev, "rtc disabled, re-enabling\n");

			tmp = readb(base + S3C2410_RTCCON);
			writeb(tmp|S3C2410_RTCCON_RTCEN, base+S3C2410_RTCCON);
		}

		if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
			dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");

			tmp = readb(base + S3C2410_RTCCON);
			writeb(tmp& ~S3C2410_RTCCON_CNTSEL, base+S3C2410_RTCCON);
		}

		if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
			dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");

			tmp = readb(base + S3C2410_RTCCON);
			writeb(tmp & ~S3C2410_RTCCON_CLKRST, base+S3C2410_RTCCON);
		}
	}
}

static int __devexit s3c_rtc_remove(struct platform_device *dev)
{
	struct rtc_device *rtc = platform_get_drvdata(dev);

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

	s3c_rtc_setpie(&dev->dev, 0);
	s3c_rtc_setaie(0);

	iounmap(s3c_rtc_base);
	release_resource(s3c_rtc_mem);
	kfree(s3c_rtc_mem);

	return 0;
}

static int __devinit s3c_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 */

	s3c_rtc_tickno = platform_get_irq(pdev, 1);
	if (s3c_rtc_tickno < 0) {
		dev_err(&pdev->dev, "no irq for rtc tick\n");
		return -ENOENT;
	}

	s3c_rtc_alarmno = platform_get_irq(pdev, 0);
	if (s3c_rtc_alarmno < 0) {
		dev_err(&pdev->dev, "no irq for alarm\n");
		return -ENOENT;
	}

	pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
		 s3c_rtc_tickno, s3c_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;
	}

	s3c_rtc_mem = request_mem_region(res->start,
					 res->end-res->start+1,
					 pdev->name);

	if (s3c_rtc_mem == NULL) {
		dev_err(&pdev->dev, "failed to reserve memory region\n");
		ret = -ENOENT;
		goto err_nores;
	}

	s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
	if (s3c_rtc_base == NULL) {
		dev_err(&pdev->dev, "failed ioremap()\n");
		ret = -EINVAL;
		goto err_nomap;
	}

	/* check to see if everything is setup correctly */

	s3c_rtc_enable(pdev, 1);

 	pr_debug("s3c2410_rtc: RTCCON=%02x\n",
		 readb(s3c_rtc_base + S3C2410_RTCCON));

	s3c_rtc_setfreq(&pdev->dev, 1);

	device_init_wakeup(&pdev->dev, 1);

	/* register RTC and exit */

	rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
				  THIS_MODULE);

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

	rtc->max_user_freq = 128;

	platform_set_drvdata(pdev, rtc);
	return 0;

 err_nortc:
	s3c_rtc_enable(pdev, 0);
	iounmap(s3c_rtc_base);

 err_nomap:
	release_resource(s3c_rtc_mem);

 err_nores:
	return ret;
}

#ifdef CONFIG_PM

/* RTC Power management control */

static int ticnt_save;

static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
{
	/* save TICNT for anyone using periodic interrupts */
	ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
	s3c_rtc_enable(pdev, 0);
	return 0;
}

static int s3c_rtc_resume(struct platform_device *pdev)
{
	s3c_rtc_enable(pdev, 1);
	writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
	return 0;
}
#else
#define s3c_rtc_suspend NULL
#define s3c_rtc_resume  NULL
#endif

static struct platform_driver s3c2410_rtc_driver = {
	.probe		= s3c_rtc_probe,
	.remove		= __devexit_p(s3c_rtc_remove),
	.suspend	= s3c_rtc_suspend,
	.resume		= s3c_rtc_resume,
	.driver		= {
		.name	= "s3c2410-rtc",
		.owner	= THIS_MODULE,
	},
};

static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";

static int __init s3c_rtc_init(void)
{
	printk(banner);
	return platform_driver_register(&s3c2410_rtc_driver);
}

static void __exit s3c_rtc_exit(void)
{
	platform_driver_unregister(&s3c2410_rtc_driver);
}

module_init(s3c_rtc_init);
module_exit(s3c_rtc_exit);

MODULE_DESCRIPTION("Samsung S3C RTC Driver");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c2410-rtc");
Commit	Line	Data
1add6781 BD	1	/* drivers/rtc/rtc-s3c.c
	2	*
	3	* Copyright (c) 2004,2006 Simtec Electronics
	4	* Ben Dooks, <ben@simtec.co.uk>
	5	* http://armlinux.simtec.co.uk/
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* S3C2410/S3C2440/S3C24XX Internal RTC Driver
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/fs.h>
	16	#include <linux/string.h>
	17	#include <linux/init.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/rtc.h>
	21	#include <linux/bcd.h>
	22	#include <linux/clk.h>
9974b6ea	23	#include <linux/log2.h>
5a0e3ad6	24	#include <linux/slab.h>
1add6781	25
a09e64fb	26	#include <mach/hardware.h>
1add6781 BD	27	#include <asm/uaccess.h>
	28	#include <asm/io.h>
	29	#include <asm/irq.h>
e2cd00cf	30	#include <plat/regs-rtc.h>
1add6781 BD	31
	32	/* I have yet to find an S3C implementation with more than one
	33	* of these rtc blocks in */
	34
	35	static struct resource *s3c_rtc_mem;
	36
	37	static void __iomem *s3c_rtc_base;
	38	static int s3c_rtc_alarmno = NO_IRQ;
	39	static int s3c_rtc_tickno = NO_IRQ;
1add6781 BD	40
1add6781 BD	41	static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
1add6781 BD	42
	43	/* IRQ Handlers */
	44
7d12e780	45	static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
1add6781 BD	46	{
	47	struct rtc_device *rdev = id;
	48
ab6a2d70	49	rtc_update_irq(rdev, 1, RTC_AF \| RTC_IRQF);
1add6781 BD	50	return IRQ_HANDLED;
	51	}
	52
7d12e780	53	static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
1add6781 BD	54	{
	55	struct rtc_device *rdev = id;
	56
773be7ee	57	rtc_update_irq(rdev, 1, RTC_PF \| RTC_IRQF);
1add6781 BD	58	return IRQ_HANDLED;
	59	}
	60
	61	/* Update control registers */
	62	static void s3c_rtc_setaie(int to)
	63	{
	64	unsigned int tmp;
	65
2a4e2b87	66	pr_debug("%s: aie=%d\n", __func__, to);
1add6781	67
9a654518	68	tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
1add6781 BD	69
	70	if (to)
	71	tmp \|= S3C2410_RTCALM_ALMEN;
	72
9a654518	73	writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
1add6781 BD	74	}
1add6781 BD	75
773be7ee	76	static int s3c_rtc_setpie(struct device *dev, int enabled)
1add6781 BD	77	{
	78	unsigned int tmp;
	79
773be7ee	80	pr_debug("%s: pie=%d\n", __func__, enabled);
1add6781 BD	81
1add6781 BD	82	spin_lock_irq(&s3c_rtc_pie_lock);
9a654518	83	tmp = readb(s3c_rtc_base + S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
1add6781	84
773be7ee	85	if (enabled)
1add6781 BD	86	tmp \|= S3C2410_TICNT_ENABLE;
1add6781 BD	87
9a654518	88	writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
1add6781	89	spin_unlock_irq(&s3c_rtc_pie_lock);
773be7ee BD	90
773be7ee BD	91	return 0;
1add6781 BD	92	}
1add6781 BD	93
773be7ee	94	static int s3c_rtc_setfreq(struct device *dev, int freq)
1add6781 BD	95	{
	96	unsigned int tmp;
	97
5d2a5037 JC	98	if (!is_power_of_2(freq))
	99	return -EINVAL;
	100
1add6781	101	spin_lock_irq(&s3c_rtc_pie_lock);
1add6781	102
773be7ee	103	tmp = readb(s3c_rtc_base + S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
1add6781 BD	104	tmp \|= (128 / freq)-1;
1add6781 BD	105
9a654518	106	writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
1add6781	107	spin_unlock_irq(&s3c_rtc_pie_lock);
773be7ee BD	108
773be7ee BD	109	return 0;
1add6781 BD	110	}
	111
	112	/* Time read/write */
	113
	114	static int s3c_rtc_gettime(struct device dev, struct rtc_time rtc_tm)
	115	{
	116	unsigned int have_retried = 0;
9a654518	117	void __iomem *base = s3c_rtc_base;
1add6781 BD	118
1add6781 BD	119	retry_get_time:
9a654518 BD	120	rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
	121	rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
	122	rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
	123	rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
	124	rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
	125	rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
1add6781 BD	126
	127	/* the only way to work out wether the system was mid-update
	128	* when we read it is to check the second counter, and if it
	129	* is zero, then we re-try the entire read
	130	*/
	131
	132	if (rtc_tm->tm_sec == 0 && !have_retried) {
	133	have_retried = 1;
	134	goto retry_get_time;
	135	}
	136
	137	pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
	138	rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
	139	rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
	140
fe20ba70 AB	141	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
	142	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
	143	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
	144	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
	145	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
	146	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
1add6781 BD	147
	148	rtc_tm->tm_year += 100;
	149	rtc_tm->tm_mon -= 1;
	150
	151	return 0;
	152	}
	153
	154	static int s3c_rtc_settime(struct device dev, struct rtc_time tm)
	155	{
9a654518	156	void __iomem *base = s3c_rtc_base;
641741e0	157	int year = tm->tm_year - 100;
9a654518	158
641741e0 BD	159	pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
	160	tm->tm_year, tm->tm_mon, tm->tm_mday,
	161	tm->tm_hour, tm->tm_min, tm->tm_sec);
	162
	163	/* we get around y2k by simply not supporting it */
1add6781	164
641741e0	165	if (year < 0 \|\| year >= 100) {
9a654518	166	dev_err(dev, "rtc only supports 100 years\n");
1add6781	167	return -EINVAL;
9a654518 BD	168	}
9a654518 BD	169
fe20ba70 AB	170	writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
	171	writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
	172	writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
	173	writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
	174	writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
	175	writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
1add6781 BD	176
	177	return 0;
	178	}
	179
	180	static int s3c_rtc_getalarm(struct device dev, struct rtc_wkalrm alrm)
	181	{
	182	struct rtc_time *alm_tm = &alrm->time;
9a654518	183	void __iomem *base = s3c_rtc_base;
1add6781 BD	184	unsigned int alm_en;
1add6781 BD	185
9a654518 BD	186	alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
	187	alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
	188	alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
	189	alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
	190	alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
	191	alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
1add6781	192
9a654518	193	alm_en = readb(base + S3C2410_RTCALM);
1add6781	194
a2db8dfc DB	195	alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
a2db8dfc DB	196
1add6781 BD	197	pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
	198	alm_en,
	199	alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
	200	alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
	201
	202
	203	/* decode the alarm enable field */
	204
	205	if (alm_en & S3C2410_RTCALM_SECEN)
fe20ba70	206	alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
1add6781 BD	207	else
	208	alm_tm->tm_sec = 0xff;
	209
	210	if (alm_en & S3C2410_RTCALM_MINEN)
fe20ba70	211	alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
1add6781 BD	212	else
	213	alm_tm->tm_min = 0xff;
	214
	215	if (alm_en & S3C2410_RTCALM_HOUREN)
fe20ba70	216	alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
1add6781 BD	217	else
	218	alm_tm->tm_hour = 0xff;
	219
	220	if (alm_en & S3C2410_RTCALM_DAYEN)
fe20ba70	221	alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
1add6781 BD	222	else
	223	alm_tm->tm_mday = 0xff;
	224
	225	if (alm_en & S3C2410_RTCALM_MONEN) {
fe20ba70	226	alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
1add6781 BD	227	alm_tm->tm_mon -= 1;
	228	} else {
	229	alm_tm->tm_mon = 0xff;
	230	}
	231
	232	if (alm_en & S3C2410_RTCALM_YEAREN)
fe20ba70	233	alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
1add6781 BD	234	else
	235	alm_tm->tm_year = 0xffff;
	236
	237	return 0;
	238	}
	239
	240	static int s3c_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	241	{
	242	struct rtc_time *tm = &alrm->time;
9a654518	243	void __iomem *base = s3c_rtc_base;
1add6781 BD	244	unsigned int alrm_en;
	245
	246	pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
	247	alrm->enabled,
	248	tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
	249	tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
	250
	251
9a654518 BD	252	alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
9a654518 BD	253	writeb(0x00, base + S3C2410_RTCALM);
1add6781 BD	254
	255	if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
	256	alrm_en \|= S3C2410_RTCALM_SECEN;
fe20ba70	257	writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
1add6781 BD	258	}
	259
	260	if (tm->tm_min < 60 && tm->tm_min >= 0) {
	261	alrm_en \|= S3C2410_RTCALM_MINEN;
fe20ba70	262	writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
1add6781 BD	263	}
	264
	265	if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
	266	alrm_en \|= S3C2410_RTCALM_HOUREN;
fe20ba70	267	writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
1add6781 BD	268	}
	269
	270	pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
	271
9a654518	272	writeb(alrm_en, base + S3C2410_RTCALM);
1add6781	273
773be7ee	274	s3c_rtc_setaie(alrm->enabled);
1add6781 BD	275
	276	if (alrm->enabled)
	277	enable_irq_wake(s3c_rtc_alarmno);
	278	else
	279	disable_irq_wake(s3c_rtc_alarmno);
	280
	281	return 0;
	282	}
	283
1add6781 BD	284	static int s3c_rtc_proc(struct device dev, struct seq_file seq)
1add6781 BD	285	{
9a654518	286	unsigned int ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
1add6781	287
1add6781 BD	288	seq_printf(seq, "periodic_IRQ\t: %s\n",
1add6781 BD	289	(ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
1add6781 BD	290	return 0;
	291	}
	292
	293	static int s3c_rtc_open(struct device *dev)
	294	{
	295	struct platform_device *pdev = to_platform_device(dev);
	296	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
	297	int ret;
	298
	299	ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
38515e90	300	IRQF_DISABLED, "s3c2410-rtc alarm", rtc_dev);
1add6781 BD	301
	302	if (ret) {
	303	dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
	304	return ret;
	305	}
	306
	307	ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
38515e90	308	IRQF_DISABLED, "s3c2410-rtc tick", rtc_dev);
1add6781 BD	309
	310	if (ret) {
	311	dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
	312	goto tick_err;
	313	}
	314
	315	return ret;
	316
	317	tick_err:
	318	free_irq(s3c_rtc_alarmno, rtc_dev);
	319	return ret;
	320	}
	321
	322	static void s3c_rtc_release(struct device *dev)
	323	{
	324	struct platform_device *pdev = to_platform_device(dev);
	325	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
	326
	327	/* do not clear AIE here, it may be needed for wake */
	328
773be7ee	329	s3c_rtc_setpie(dev, 0);
1add6781 BD	330	free_irq(s3c_rtc_alarmno, rtc_dev);
	331	free_irq(s3c_rtc_tickno, rtc_dev);
	332	}
	333
ff8371ac	334	static const struct rtc_class_ops s3c_rtcops = {
1add6781 BD	335	.open = s3c_rtc_open,
1add6781 BD	336	.release = s3c_rtc_release,
1add6781 BD	337	.read_time = s3c_rtc_gettime,
	338	.set_time = s3c_rtc_settime,
	339	.read_alarm = s3c_rtc_getalarm,
	340	.set_alarm = s3c_rtc_setalarm,
773be7ee BD	341	.irq_set_freq = s3c_rtc_setfreq,
773be7ee BD	342	.irq_set_state = s3c_rtc_setpie,
1add6781 BD	343	.proc = s3c_rtc_proc,
	344	};
	345
	346	static void s3c_rtc_enable(struct platform_device *pdev, int en)
	347	{
9a654518	348	void __iomem *base = s3c_rtc_base;
1add6781 BD	349	unsigned int tmp;
	350
	351	if (s3c_rtc_base == NULL)
	352	return;
	353
	354	if (!en) {
9a654518 BD	355	tmp = readb(base + S3C2410_RTCCON);
9a654518 BD	356	writeb(tmp & ~S3C2410_RTCCON_RTCEN, base + S3C2410_RTCCON);
1add6781	357
9a654518 BD	358	tmp = readb(base + S3C2410_TICNT);
9a654518 BD	359	writeb(tmp & ~S3C2410_TICNT_ENABLE, base + S3C2410_TICNT);
1add6781 BD	360	} else {
	361	/* re-enable the device, and check it is ok */
	362
9a654518	363	if ((readb(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
1add6781 BD	364	dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
1add6781 BD	365
9a654518 BD	366	tmp = readb(base + S3C2410_RTCCON);
9a654518 BD	367	writeb(tmp\|S3C2410_RTCCON_RTCEN, base+S3C2410_RTCCON);
1add6781 BD	368	}
1add6781 BD	369
9a654518	370	if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
1add6781 BD	371	dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
1add6781 BD	372
9a654518 BD	373	tmp = readb(base + S3C2410_RTCCON);
9a654518 BD	374	writeb(tmp& ~S3C2410_RTCCON_CNTSEL, base+S3C2410_RTCCON);
1add6781 BD	375	}
1add6781 BD	376
9a654518	377	if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
1add6781 BD	378	dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
1add6781 BD	379
9a654518 BD	380	tmp = readb(base + S3C2410_RTCCON);
9a654518 BD	381	writeb(tmp & ~S3C2410_RTCCON_CLKRST, base+S3C2410_RTCCON);
1add6781 BD	382	}
	383	}
	384	}
	385
4cd0c5c4	386	static int __devexit s3c_rtc_remove(struct platform_device *dev)
1add6781 BD	387	{
	388	struct rtc_device *rtc = platform_get_drvdata(dev);
	389
	390	platform_set_drvdata(dev, NULL);
	391	rtc_device_unregister(rtc);
	392
773be7ee	393	s3c_rtc_setpie(&dev->dev, 0);
1add6781 BD	394	s3c_rtc_setaie(0);
	395
	396	iounmap(s3c_rtc_base);
	397	release_resource(s3c_rtc_mem);
	398	kfree(s3c_rtc_mem);
	399
	400	return 0;
	401	}
	402
4cd0c5c4	403	static int __devinit s3c_rtc_probe(struct platform_device *pdev)
1add6781 BD	404	{
	405	struct rtc_device *rtc;
	406	struct resource *res;
	407	int ret;
	408
2a4e2b87	409	pr_debug("%s: probe=%p\n", __func__, pdev);
1add6781 BD	410
	411	/* find the IRQs */
	412
	413	s3c_rtc_tickno = platform_get_irq(pdev, 1);
	414	if (s3c_rtc_tickno < 0) {
	415	dev_err(&pdev->dev, "no irq for rtc tick\n");
	416	return -ENOENT;
	417	}
	418
	419	s3c_rtc_alarmno = platform_get_irq(pdev, 0);
	420	if (s3c_rtc_alarmno < 0) {
	421	dev_err(&pdev->dev, "no irq for alarm\n");
	422	return -ENOENT;
	423	}
	424
	425	pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
	426	s3c_rtc_tickno, s3c_rtc_alarmno);
	427
	428	/* get the memory region */
	429
	430	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	431	if (res == NULL) {
	432	dev_err(&pdev->dev, "failed to get memory region resource\n");
	433	return -ENOENT;
	434	}
	435
	436	s3c_rtc_mem = request_mem_region(res->start,
9a654518 BD	437	res->end-res->start+1,
9a654518 BD	438	pdev->name);
1add6781 BD	439
	440	if (s3c_rtc_mem == NULL) {
	441	dev_err(&pdev->dev, "failed to reserve memory region\n");
	442	ret = -ENOENT;
	443	goto err_nores;
	444	}
	445
	446	s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
	447	if (s3c_rtc_base == NULL) {
	448	dev_err(&pdev->dev, "failed ioremap()\n");
	449	ret = -EINVAL;
	450	goto err_nomap;
	451	}
	452
	453	/* check to see if everything is setup correctly */
	454
	455	s3c_rtc_enable(pdev, 1);
	456
9a654518 BD	457	pr_debug("s3c2410_rtc: RTCCON=%02x\n",
9a654518 BD	458	readb(s3c_rtc_base + S3C2410_RTCCON));
1add6781	459
773be7ee	460	s3c_rtc_setfreq(&pdev->dev, 1);
1add6781	461
51b7616e YK	462	device_init_wakeup(&pdev->dev, 1);
51b7616e YK	463
1add6781 BD	464	/* register RTC and exit */
	465
	466	rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
	467	THIS_MODULE);
	468
	469	if (IS_ERR(rtc)) {
	470	dev_err(&pdev->dev, "cannot attach rtc\n");
	471	ret = PTR_ERR(rtc);
	472	goto err_nortc;
	473	}
	474
	475	rtc->max_user_freq = 128;
	476
	477	platform_set_drvdata(pdev, rtc);
	478	return 0;
	479
	480	err_nortc:
	481	s3c_rtc_enable(pdev, 0);
	482	iounmap(s3c_rtc_base);
	483
	484	err_nomap:
	485	release_resource(s3c_rtc_mem);
	486
	487	err_nores:
	488	return ret;
	489	}
	490
	491	#ifdef CONFIG_PM
	492
	493	/* RTC Power management control */
	494
1add6781 BD	495	static int ticnt_save;
	496
	497	static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
	498	{
1add6781	499	/* save TICNT for anyone using periodic interrupts */
9a654518	500	ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
1add6781	501	s3c_rtc_enable(pdev, 0);
1add6781 BD	502	return 0;
	503	}
	504
	505	static int s3c_rtc_resume(struct platform_device *pdev)
	506	{
1add6781	507	s3c_rtc_enable(pdev, 1);
9a654518	508	writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
1add6781 BD	509	return 0;
	510	}
	511	#else
	512	#define s3c_rtc_suspend NULL
	513	#define s3c_rtc_resume NULL
	514	#endif
	515
eb944db0	516	static struct platform_driver s3c2410_rtc_driver = {
1add6781	517	.probe = s3c_rtc_probe,
4cd0c5c4	518	.remove = __devexit_p(s3c_rtc_remove),
1add6781 BD	519	.suspend = s3c_rtc_suspend,
	520	.resume = s3c_rtc_resume,
	521	.driver = {
	522	.name = "s3c2410-rtc",
	523	.owner = THIS_MODULE,
	524	},
	525	};
	526
	527	static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
	528
	529	static int __init s3c_rtc_init(void)
	530	{
	531	printk(banner);
eb944db0	532	return platform_driver_register(&s3c2410_rtc_driver);
1add6781 BD	533	}
	534
	535	static void __exit s3c_rtc_exit(void)
	536	{
eb944db0	537	platform_driver_unregister(&s3c2410_rtc_driver);
1add6781 BD	538	}
	539
	540	module_init(s3c_rtc_init);
	541	module_exit(s3c_rtc_exit);
	542
	543	MODULE_DESCRIPTION("Samsung S3C RTC Driver");
	544	MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
	545	MODULE_LICENSE("GPL");
ad28a07b	546	MODULE_ALIAS("platform:s3c2410-rtc");