[net-next-2.6.git] / drivers / rtc / rtc-s3c.c

/* drivers/rtc/rtc-s3c.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com/
 *
 * 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>

enum s3c_cpu_type {
	TYPE_S3C2410,
	TYPE_S3C64XX,
};

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

static struct resource *s3c_rtc_mem;

static struct clk *rtc_clk;
static void __iomem *s3c_rtc_base;
static int s3c_rtc_alarmno = NO_IRQ;
static int s3c_rtc_tickno  = NO_IRQ;
static enum s3c_cpu_type s3c_rtc_cpu_type;

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);

	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
		writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);

	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);

	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
		writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);

	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);

	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
		tmp = readb(s3c_rtc_base + S3C2410_RTCCON);
		tmp &= ~S3C64XX_RTCCON_TICEN;

		if (enabled)
			tmp |= S3C64XX_RTCCON_TICEN;

		writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
	} else {
		tmp = readb(s3c_rtc_base + S3C2410_TICNT);
		tmp &= ~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)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
	unsigned int tmp = 0;

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

	spin_lock_irq(&s3c_rtc_pie_lock);

	if (s3c_rtc_cpu_type == TYPE_S3C2410) {
		tmp = readb(s3c_rtc_base + S3C2410_TICNT);
		tmp &= S3C2410_TICNT_ENABLE;
	}

	tmp |= (rtc_dev->max_user_freq / freq)-1;

	writel(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);

	return 0;
}

static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
{
	unsigned int ticnt;

	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
		ticnt = readb(s3c_rtc_base + S3C2410_RTCCON);
		ticnt &= S3C64XX_RTCCON_TICEN;
	} else {
		ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
		ticnt &= S3C2410_TICNT_ENABLE;
	}

	seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "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);
		if (s3c_rtc_cpu_type == TYPE_S3C64XX)
			tmp &= ~S3C64XX_RTCCON_TICEN;
		tmp &= ~S3C2410_RTCCON_RTCEN;
		writeb(tmp, base + S3C2410_RTCCON);

		if (s3c_rtc_cpu_type == TYPE_S3C2410) {
			tmp = readb(base + S3C2410_TICNT);
			tmp &= ~S3C2410_TICNT_ENABLE;
			writeb(tmp, 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);

	clk_disable(rtc_clk);
	clk_put(rtc_clk);
	rtc_clk = NULL;

	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;
	unsigned int tmp, i;
	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;
	}

	rtc_clk = clk_get(&pdev->dev, "rtc");
	if (IS_ERR(rtc_clk)) {
		dev_err(&pdev->dev, "failed to find rtc clock source\n");
		ret = PTR_ERR(rtc_clk);
		rtc_clk = NULL;
		goto err_clk;
	}

	clk_enable(rtc_clk);

	/* 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));

	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;
	}

	s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;

	/* Check RTC Time */

	for (i = S3C2410_RTCSEC; i <= S3C2410_RTCYEAR; i += 0x4) {
		tmp = readb(s3c_rtc_base + i);

		if ((tmp & 0xf) > 0x9 || ((tmp >> 4) & 0xf) > 0x9)
			writeb(0, s3c_rtc_base + i);
	}

	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
		rtc->max_user_freq = 32768;
	else
		rtc->max_user_freq = 128;

	platform_set_drvdata(pdev, rtc);

	s3c_rtc_setfreq(&pdev->dev, 1);

	return 0;

 err_nortc:
	s3c_rtc_enable(pdev, 0);
	clk_disable(rtc_clk);
	clk_put(rtc_clk);

 err_clk:
	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, ticnt_en_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);
	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
		ticnt_en_save = readb(s3c_rtc_base + S3C2410_RTCCON);
		ticnt_en_save &= S3C64XX_RTCCON_TICEN;
	}
	s3c_rtc_enable(pdev, 0);

	if (device_may_wakeup(&pdev->dev))
		enable_irq_wake(s3c_rtc_alarmno);

	return 0;
}

static int s3c_rtc_resume(struct platform_device *pdev)
{
	unsigned int tmp;

	s3c_rtc_enable(pdev, 1);
	writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
	if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
		tmp = readb(s3c_rtc_base + S3C2410_RTCCON);
		writeb(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
	}

	if (device_may_wakeup(&pdev->dev))
		disable_irq_wake(s3c_rtc_alarmno);

	return 0;
}
#else
#define s3c_rtc_suspend NULL
#define s3c_rtc_resume  NULL
#endif

static struct platform_device_id s3c_rtc_driver_ids[] = {
	{
		.name		= "s3c2410-rtc",
		.driver_data	= TYPE_S3C2410,
	}, {
		.name		= "s3c64xx-rtc",
		.driver_data	= TYPE_S3C64XX,
	},
	{ }
};

MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);

static struct platform_driver s3c_rtc_driver = {
	.probe		= s3c_rtc_probe,
	.remove		= __devexit_p(s3c_rtc_remove),
	.suspend	= s3c_rtc_suspend,
	.resume		= s3c_rtc_resume,
	.id_table	= s3c_rtc_driver_ids,
	.driver		= {
		.name	= "s3c-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(&s3c_rtc_driver);
}

static void __exit s3c_rtc_exit(void)
{
	platform_driver_unregister(&s3c_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	1	/* drivers/rtc/rtc-s3c.c
e48add8c AD	2	*
	3	* Copyright (c) 2010 Samsung Electronics Co., Ltd.
	4	* http://www.samsung.com/
1add6781 BD	5	*
	6	* Copyright (c) 2004,2006 Simtec Electronics
	7	* Ben Dooks, <ben@simtec.co.uk>
	8	* http://armlinux.simtec.co.uk/
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	* S3C2410/S3C2440/S3C24XX Internal RTC Driver
	15	*/
	16
	17	#include <linux/module.h>
	18	#include <linux/fs.h>
	19	#include <linux/string.h>
	20	#include <linux/init.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/rtc.h>
	24	#include <linux/bcd.h>
	25	#include <linux/clk.h>
9974b6ea	26	#include <linux/log2.h>
5a0e3ad6	27	#include <linux/slab.h>
1add6781	28
a09e64fb	29	#include <mach/hardware.h>
1add6781 BD	30	#include <asm/uaccess.h>
	31	#include <asm/io.h>
	32	#include <asm/irq.h>
e2cd00cf	33	#include <plat/regs-rtc.h>
1add6781	34
9f4123b7 MC	35	enum s3c_cpu_type {
	36	TYPE_S3C2410,
	37	TYPE_S3C64XX,
	38	};
	39
1add6781 BD	40	/* I have yet to find an S3C implementation with more than one
	41	* of these rtc blocks in */
	42
	43	static struct resource *s3c_rtc_mem;
	44
e48add8c	45	static struct clk *rtc_clk;
1add6781 BD	46	static void __iomem *s3c_rtc_base;
	47	static int s3c_rtc_alarmno = NO_IRQ;
	48	static int s3c_rtc_tickno = NO_IRQ;
9f4123b7	49	static enum s3c_cpu_type s3c_rtc_cpu_type;
1add6781 BD	50
1add6781 BD	51	static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
1add6781 BD	52
	53	/* IRQ Handlers */
	54
7d12e780	55	static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
1add6781 BD	56	{
	57	struct rtc_device *rdev = id;
	58
ab6a2d70	59	rtc_update_irq(rdev, 1, RTC_AF \| RTC_IRQF);
2f3478f6 AD	60
	61	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
	62	writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
	63
1add6781 BD	64	return IRQ_HANDLED;
	65	}
	66
7d12e780	67	static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
1add6781 BD	68	{
	69	struct rtc_device *rdev = id;
	70
773be7ee	71	rtc_update_irq(rdev, 1, RTC_PF \| RTC_IRQF);
2f3478f6 AD	72
	73	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
	74	writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
	75
1add6781 BD	76	return IRQ_HANDLED;
	77	}
	78
	79	/* Update control registers */
	80	static void s3c_rtc_setaie(int to)
	81	{
	82	unsigned int tmp;
	83
2a4e2b87	84	pr_debug("%s: aie=%d\n", __func__, to);
1add6781	85
9a654518	86	tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
1add6781 BD	87
	88	if (to)
	89	tmp \|= S3C2410_RTCALM_ALMEN;
	90
9a654518	91	writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
1add6781 BD	92	}
1add6781 BD	93
773be7ee	94	static int s3c_rtc_setpie(struct device *dev, int enabled)
1add6781 BD	95	{
	96	unsigned int tmp;
	97
773be7ee	98	pr_debug("%s: pie=%d\n", __func__, enabled);
1add6781 BD	99
1add6781 BD	100	spin_lock_irq(&s3c_rtc_pie_lock);
1add6781	101
9f4123b7 MC	102	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
	103	tmp = readb(s3c_rtc_base + S3C2410_RTCCON);
	104	tmp &= ~S3C64XX_RTCCON_TICEN;
	105
	106	if (enabled)
	107	tmp \|= S3C64XX_RTCCON_TICEN;
	108
2f3478f6	109	writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
9f4123b7 MC	110	} else {
	111	tmp = readb(s3c_rtc_base + S3C2410_TICNT);
	112	tmp &= ~S3C2410_TICNT_ENABLE;
	113
	114	if (enabled)
	115	tmp \|= S3C2410_TICNT_ENABLE;
	116
	117	writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
	118	}
1add6781	119
1add6781	120	spin_unlock_irq(&s3c_rtc_pie_lock);
773be7ee BD	121
773be7ee BD	122	return 0;
1add6781 BD	123	}
1add6781 BD	124
773be7ee	125	static int s3c_rtc_setfreq(struct device *dev, int freq)
1add6781	126	{
9f4123b7 MC	127	struct platform_device *pdev = to_platform_device(dev);
	128	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
	129	unsigned int tmp = 0;
1add6781	130
5d2a5037 JC	131	if (!is_power_of_2(freq))
	132	return -EINVAL;
	133
1add6781	134	spin_lock_irq(&s3c_rtc_pie_lock);
1add6781	135
9f4123b7 MC	136	if (s3c_rtc_cpu_type == TYPE_S3C2410) {
	137	tmp = readb(s3c_rtc_base + S3C2410_TICNT);
	138	tmp &= S3C2410_TICNT_ENABLE;
	139	}
	140
	141	tmp \|= (rtc_dev->max_user_freq / freq)-1;
1add6781	142
2f3478f6	143	writel(tmp, s3c_rtc_base + S3C2410_TICNT);
1add6781	144	spin_unlock_irq(&s3c_rtc_pie_lock);
773be7ee BD	145
773be7ee BD	146	return 0;
1add6781 BD	147	}
	148
	149	/* Time read/write */
	150
	151	static int s3c_rtc_gettime(struct device dev, struct rtc_time rtc_tm)
	152	{
	153	unsigned int have_retried = 0;
9a654518	154	void __iomem *base = s3c_rtc_base;
1add6781 BD	155
1add6781 BD	156	retry_get_time:
9a654518 BD	157	rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
	158	rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
	159	rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
	160	rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
	161	rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
	162	rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
1add6781 BD	163
	164	/* the only way to work out wether the system was mid-update
	165	* when we read it is to check the second counter, and if it
	166	* is zero, then we re-try the entire read
	167	*/
	168
	169	if (rtc_tm->tm_sec == 0 && !have_retried) {
	170	have_retried = 1;
	171	goto retry_get_time;
	172	}
	173
	174	pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
	175	rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
	176	rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
	177
fe20ba70 AB	178	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
	179	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
	180	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
	181	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
	182	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
	183	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
1add6781 BD	184
	185	rtc_tm->tm_year += 100;
	186	rtc_tm->tm_mon -= 1;
	187
	188	return 0;
	189	}
	190
	191	static int s3c_rtc_settime(struct device dev, struct rtc_time tm)
	192	{
9a654518	193	void __iomem *base = s3c_rtc_base;
641741e0	194	int year = tm->tm_year - 100;
9a654518	195
641741e0 BD	196	pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
	197	tm->tm_year, tm->tm_mon, tm->tm_mday,
	198	tm->tm_hour, tm->tm_min, tm->tm_sec);
	199
	200	/* we get around y2k by simply not supporting it */
1add6781	201
641741e0	202	if (year < 0 \|\| year >= 100) {
9a654518	203	dev_err(dev, "rtc only supports 100 years\n");
1add6781	204	return -EINVAL;
9a654518 BD	205	}
9a654518 BD	206
fe20ba70 AB	207	writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
	208	writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
	209	writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
	210	writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
	211	writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
	212	writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
1add6781 BD	213
	214	return 0;
	215	}
	216
	217	static int s3c_rtc_getalarm(struct device dev, struct rtc_wkalrm alrm)
	218	{
	219	struct rtc_time *alm_tm = &alrm->time;
9a654518	220	void __iomem *base = s3c_rtc_base;
1add6781 BD	221	unsigned int alm_en;
1add6781 BD	222
9a654518 BD	223	alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
	224	alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
	225	alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
	226	alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
	227	alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
	228	alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
1add6781	229
9a654518	230	alm_en = readb(base + S3C2410_RTCALM);
1add6781	231
a2db8dfc DB	232	alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
a2db8dfc DB	233
1add6781 BD	234	pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
	235	alm_en,
	236	alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
	237	alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
	238
	239
	240	/* decode the alarm enable field */
	241
	242	if (alm_en & S3C2410_RTCALM_SECEN)
fe20ba70	243	alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
1add6781 BD	244	else
	245	alm_tm->tm_sec = 0xff;
	246
	247	if (alm_en & S3C2410_RTCALM_MINEN)
fe20ba70	248	alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
1add6781 BD	249	else
	250	alm_tm->tm_min = 0xff;
	251
	252	if (alm_en & S3C2410_RTCALM_HOUREN)
fe20ba70	253	alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
1add6781 BD	254	else
	255	alm_tm->tm_hour = 0xff;
	256
	257	if (alm_en & S3C2410_RTCALM_DAYEN)
fe20ba70	258	alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
1add6781 BD	259	else
	260	alm_tm->tm_mday = 0xff;
	261
	262	if (alm_en & S3C2410_RTCALM_MONEN) {
fe20ba70	263	alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
1add6781 BD	264	alm_tm->tm_mon -= 1;
	265	} else {
	266	alm_tm->tm_mon = 0xff;
	267	}
	268
	269	if (alm_en & S3C2410_RTCALM_YEAREN)
fe20ba70	270	alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
1add6781 BD	271	else
	272	alm_tm->tm_year = 0xffff;
	273
	274	return 0;
	275	}
	276
	277	static int s3c_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	278	{
	279	struct rtc_time *tm = &alrm->time;
9a654518	280	void __iomem *base = s3c_rtc_base;
1add6781 BD	281	unsigned int alrm_en;
	282
	283	pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
	284	alrm->enabled,
	285	tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
	286	tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
	287
	288
9a654518 BD	289	alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
9a654518 BD	290	writeb(0x00, base + S3C2410_RTCALM);
1add6781 BD	291
	292	if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
	293	alrm_en \|= S3C2410_RTCALM_SECEN;
fe20ba70	294	writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
1add6781 BD	295	}
	296
	297	if (tm->tm_min < 60 && tm->tm_min >= 0) {
	298	alrm_en \|= S3C2410_RTCALM_MINEN;
fe20ba70	299	writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
1add6781 BD	300	}
	301
	302	if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
	303	alrm_en \|= S3C2410_RTCALM_HOUREN;
fe20ba70	304	writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
1add6781 BD	305	}
	306
	307	pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
	308
9a654518	309	writeb(alrm_en, base + S3C2410_RTCALM);
1add6781	310
773be7ee	311	s3c_rtc_setaie(alrm->enabled);
1add6781	312
1add6781 BD	313	return 0;
	314	}
	315
1add6781 BD	316	static int s3c_rtc_proc(struct device dev, struct seq_file seq)
1add6781 BD	317	{
9f4123b7	318	unsigned int ticnt;
1add6781	319
9f4123b7 MC	320	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
	321	ticnt = readb(s3c_rtc_base + S3C2410_RTCCON);
	322	ticnt &= S3C64XX_RTCCON_TICEN;
	323	} else {
	324	ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
	325	ticnt &= S3C2410_TICNT_ENABLE;
	326	}
	327
	328	seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
1add6781 BD	329	return 0;
	330	}
	331
	332	static int s3c_rtc_open(struct device *dev)
	333	{
	334	struct platform_device *pdev = to_platform_device(dev);
	335	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
	336	int ret;
	337
	338	ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
38515e90	339	IRQF_DISABLED, "s3c2410-rtc alarm", rtc_dev);
1add6781 BD	340
	341	if (ret) {
	342	dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
	343	return ret;
	344	}
	345
	346	ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
38515e90	347	IRQF_DISABLED, "s3c2410-rtc tick", rtc_dev);
1add6781 BD	348
	349	if (ret) {
	350	dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
	351	goto tick_err;
	352	}
	353
	354	return ret;
	355
	356	tick_err:
	357	free_irq(s3c_rtc_alarmno, rtc_dev);
	358	return ret;
	359	}
	360
	361	static void s3c_rtc_release(struct device *dev)
	362	{
	363	struct platform_device *pdev = to_platform_device(dev);
	364	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
	365
	366	/* do not clear AIE here, it may be needed for wake */
	367
773be7ee	368	s3c_rtc_setpie(dev, 0);
1add6781 BD	369	free_irq(s3c_rtc_alarmno, rtc_dev);
	370	free_irq(s3c_rtc_tickno, rtc_dev);
	371	}
	372
ff8371ac	373	static const struct rtc_class_ops s3c_rtcops = {
1add6781 BD	374	.open = s3c_rtc_open,
1add6781 BD	375	.release = s3c_rtc_release,
1add6781 BD	376	.read_time = s3c_rtc_gettime,
	377	.set_time = s3c_rtc_settime,
	378	.read_alarm = s3c_rtc_getalarm,
	379	.set_alarm = s3c_rtc_setalarm,
773be7ee BD	380	.irq_set_freq = s3c_rtc_setfreq,
773be7ee BD	381	.irq_set_state = s3c_rtc_setpie,
1add6781 BD	382	.proc = s3c_rtc_proc,
	383	};
	384
	385	static void s3c_rtc_enable(struct platform_device *pdev, int en)
	386	{
9a654518	387	void __iomem *base = s3c_rtc_base;
1add6781 BD	388	unsigned int tmp;
	389
	390	if (s3c_rtc_base == NULL)
	391	return;
	392
	393	if (!en) {
9a654518	394	tmp = readb(base + S3C2410_RTCCON);
9f4123b7 MC	395	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
	396	tmp &= ~S3C64XX_RTCCON_TICEN;
	397	tmp &= ~S3C2410_RTCCON_RTCEN;
	398	writeb(tmp, base + S3C2410_RTCCON);
	399
	400	if (s3c_rtc_cpu_type == TYPE_S3C2410) {
	401	tmp = readb(base + S3C2410_TICNT);
	402	tmp &= ~S3C2410_TICNT_ENABLE;
	403	writeb(tmp, base + S3C2410_TICNT);
	404	}
1add6781 BD	405	} else {
	406	/* re-enable the device, and check it is ok */
	407
9a654518	408	if ((readb(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
1add6781 BD	409	dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
1add6781 BD	410
9a654518 BD	411	tmp = readb(base + S3C2410_RTCCON);
9a654518 BD	412	writeb(tmp\|S3C2410_RTCCON_RTCEN, base+S3C2410_RTCCON);
1add6781 BD	413	}
1add6781 BD	414
9a654518	415	if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
1add6781 BD	416	dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
1add6781 BD	417
9a654518 BD	418	tmp = readb(base + S3C2410_RTCCON);
9a654518 BD	419	writeb(tmp& ~S3C2410_RTCCON_CNTSEL, base+S3C2410_RTCCON);
1add6781 BD	420	}
1add6781 BD	421
9a654518	422	if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
1add6781 BD	423	dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
1add6781 BD	424
9a654518 BD	425	tmp = readb(base + S3C2410_RTCCON);
9a654518 BD	426	writeb(tmp & ~S3C2410_RTCCON_CLKRST, base+S3C2410_RTCCON);
1add6781 BD	427	}
	428	}
	429	}
	430
4cd0c5c4	431	static int __devexit s3c_rtc_remove(struct platform_device *dev)
1add6781 BD	432	{
	433	struct rtc_device *rtc = platform_get_drvdata(dev);
	434
	435	platform_set_drvdata(dev, NULL);
	436	rtc_device_unregister(rtc);
	437
773be7ee	438	s3c_rtc_setpie(&dev->dev, 0);
1add6781 BD	439	s3c_rtc_setaie(0);
1add6781 BD	440
e48add8c AD	441	clk_disable(rtc_clk);
	442	clk_put(rtc_clk);
	443	rtc_clk = NULL;
	444
1add6781 BD	445	iounmap(s3c_rtc_base);
	446	release_resource(s3c_rtc_mem);
	447	kfree(s3c_rtc_mem);
	448
	449	return 0;
	450	}
	451
4cd0c5c4	452	static int __devinit s3c_rtc_probe(struct platform_device *pdev)
1add6781 BD	453	{
	454	struct rtc_device *rtc;
	455	struct resource *res;
051fe54e	456	unsigned int tmp, i;
1add6781 BD	457	int ret;
1add6781 BD	458
2a4e2b87	459	pr_debug("%s: probe=%p\n", __func__, pdev);
1add6781 BD	460
	461	/* find the IRQs */
	462
	463	s3c_rtc_tickno = platform_get_irq(pdev, 1);
	464	if (s3c_rtc_tickno < 0) {
	465	dev_err(&pdev->dev, "no irq for rtc tick\n");
	466	return -ENOENT;
	467	}
	468
	469	s3c_rtc_alarmno = platform_get_irq(pdev, 0);
	470	if (s3c_rtc_alarmno < 0) {
	471	dev_err(&pdev->dev, "no irq for alarm\n");
	472	return -ENOENT;
	473	}
	474
	475	pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
	476	s3c_rtc_tickno, s3c_rtc_alarmno);
	477
	478	/* get the memory region */
	479
	480	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	481	if (res == NULL) {
	482	dev_err(&pdev->dev, "failed to get memory region resource\n");
	483	return -ENOENT;
	484	}
	485
	486	s3c_rtc_mem = request_mem_region(res->start,
9a654518 BD	487	res->end-res->start+1,
9a654518 BD	488	pdev->name);
1add6781 BD	489
	490	if (s3c_rtc_mem == NULL) {
	491	dev_err(&pdev->dev, "failed to reserve memory region\n");
	492	ret = -ENOENT;
	493	goto err_nores;
	494	}
	495
	496	s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
	497	if (s3c_rtc_base == NULL) {
	498	dev_err(&pdev->dev, "failed ioremap()\n");
	499	ret = -EINVAL;
	500	goto err_nomap;
	501	}
	502
e48add8c AD	503	rtc_clk = clk_get(&pdev->dev, "rtc");
	504	if (IS_ERR(rtc_clk)) {
	505	dev_err(&pdev->dev, "failed to find rtc clock source\n");
	506	ret = PTR_ERR(rtc_clk);
	507	rtc_clk = NULL;
	508	goto err_clk;
	509	}
	510
	511	clk_enable(rtc_clk);
	512
1add6781 BD	513	/* check to see if everything is setup correctly */
	514
	515	s3c_rtc_enable(pdev, 1);
	516
9a654518 BD	517	pr_debug("s3c2410_rtc: RTCCON=%02x\n",
9a654518 BD	518	readb(s3c_rtc_base + S3C2410_RTCCON));
1add6781	519
51b7616e YK	520	device_init_wakeup(&pdev->dev, 1);
51b7616e YK	521
1add6781 BD	522	/* register RTC and exit */
	523
	524	rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
	525	THIS_MODULE);
	526
	527	if (IS_ERR(rtc)) {
	528	dev_err(&pdev->dev, "cannot attach rtc\n");
	529	ret = PTR_ERR(rtc);
	530	goto err_nortc;
	531	}
	532
eaa6e4dd MC	533	s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;
eaa6e4dd MC	534
051fe54e TK	535	/* Check RTC Time */
	536
	537	for (i = S3C2410_RTCSEC; i <= S3C2410_RTCYEAR; i += 0x4) {
	538	tmp = readb(s3c_rtc_base + i);
	539
	540	if ((tmp & 0xf) > 0x9 \|\| ((tmp >> 4) & 0xf) > 0x9)
	541	writeb(0, s3c_rtc_base + i);
	542	}
	543
9f4123b7 MC	544	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
	545	rtc->max_user_freq = 32768;
	546	else
	547	rtc->max_user_freq = 128;
	548
1add6781	549	platform_set_drvdata(pdev, rtc);
e893de59 MC	550
	551	s3c_rtc_setfreq(&pdev->dev, 1);
	552
1add6781 BD	553	return 0;
	554
	555	err_nortc:
	556	s3c_rtc_enable(pdev, 0);
e48add8c AD	557	clk_disable(rtc_clk);
	558	clk_put(rtc_clk);
	559
	560	err_clk:
1add6781 BD	561	iounmap(s3c_rtc_base);
	562
	563	err_nomap:
	564	release_resource(s3c_rtc_mem);
	565
	566	err_nores:
	567	return ret;
	568	}
	569
	570	#ifdef CONFIG_PM
	571
	572	/* RTC Power management control */
	573
9f4123b7	574	static int ticnt_save, ticnt_en_save;
1add6781 BD	575
	576	static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
	577	{
1add6781	578	/* save TICNT for anyone using periodic interrupts */
9a654518	579	ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
9f4123b7 MC	580	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
	581	ticnt_en_save = readb(s3c_rtc_base + S3C2410_RTCCON);
	582	ticnt_en_save &= S3C64XX_RTCCON_TICEN;
	583	}
1add6781	584	s3c_rtc_enable(pdev, 0);
f501ed52 VZ	585
	586	if (device_may_wakeup(&pdev->dev))
	587	enable_irq_wake(s3c_rtc_alarmno);
	588
1add6781 BD	589	return 0;
	590	}
	591
	592	static int s3c_rtc_resume(struct platform_device *pdev)
	593	{
9f4123b7 MC	594	unsigned int tmp;
9f4123b7 MC	595
1add6781	596	s3c_rtc_enable(pdev, 1);
9a654518	597	writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
9f4123b7 MC	598	if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
	599	tmp = readb(s3c_rtc_base + S3C2410_RTCCON);
	600	writeb(tmp \| ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
	601	}
f501ed52 VZ	602
	603	if (device_may_wakeup(&pdev->dev))
	604	disable_irq_wake(s3c_rtc_alarmno);
	605
1add6781 BD	606	return 0;
	607	}
	608	#else
	609	#define s3c_rtc_suspend NULL
	610	#define s3c_rtc_resume NULL
	611	#endif
	612
9f4123b7 MC	613	static struct platform_device_id s3c_rtc_driver_ids[] = {
	614	{
	615	.name = "s3c2410-rtc",
	616	.driver_data = TYPE_S3C2410,
	617	}, {
	618	.name = "s3c64xx-rtc",
	619	.driver_data = TYPE_S3C64XX,
	620	},
	621	{ }
	622	};
	623
	624	MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
	625
	626	static struct platform_driver s3c_rtc_driver = {
1add6781	627	.probe = s3c_rtc_probe,
4cd0c5c4	628	.remove = __devexit_p(s3c_rtc_remove),
1add6781 BD	629	.suspend = s3c_rtc_suspend,
1add6781 BD	630	.resume = s3c_rtc_resume,
9f4123b7	631	.id_table = s3c_rtc_driver_ids,
1add6781	632	.driver = {
9f4123b7	633	.name = "s3c-rtc",
1add6781 BD	634	.owner = THIS_MODULE,
	635	},
	636	};
	637
	638	static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
	639
	640	static int __init s3c_rtc_init(void)
	641	{
	642	printk(banner);
9f4123b7	643	return platform_driver_register(&s3c_rtc_driver);
1add6781 BD	644	}
	645
	646	static void __exit s3c_rtc_exit(void)
	647	{
9f4123b7	648	platform_driver_unregister(&s3c_rtc_driver);
1add6781 BD	649	}
	650
	651	module_init(s3c_rtc_init);
	652	module_exit(s3c_rtc_exit);
	653
	654	MODULE_DESCRIPTION("Samsung S3C RTC Driver");
	655	MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
	656	MODULE_LICENSE("GPL");
ad28a07b	657	MODULE_ALIAS("platform:s3c2410-rtc");