/* 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 <linux/uaccess.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <plat/regs-rtc.h>

enum s3c_cpu_type {
	TYPE_S3C2410,
	TYPE_S3C64XX,
	TYPE_EXYNOS,
};

/* 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 bool wake_en;
static enum s3c_cpu_type s3c_rtc_cpu_type;

/* 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_S3C2410)
		writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);

	return IRQ_HANDLED;
}

/* Update control registers */
static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
{
	unsigned int tmp;

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

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

	if (enabled)
		tmp |= S3C2410_RTCALM_ALMEN;

	writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);

	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);

	if (s3c_rtc_cpu_type == TYPE_EXYNOS)
		rtc_tm->tm_year = readw(base + S3C2410_RTCYEAR) & 0x0fff;
	else
		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;
	}

	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);

	if (s3c_rtc_cpu_type == TYPE_EXYNOS)
		rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year)
			+ (rtc_tm->tm_year >> 8) * 100;
	else
		rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);

	rtc_tm->tm_year += 100;

	pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d\n",
		 1900 + 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_mon -= 1;

	return rtc_valid_tm(rtc_tm);
}

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 %04d.%02d.%02d %02d:%02d:%02d\n",
		 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
		 tm->tm_hour, tm->tm_min, tm->tm_sec);

	if (year < 0 || year >= 100) {
		if (!(s3c_rtc_cpu_type == TYPE_EXYNOS
					&& year >= 100 && year < 1000)) {
			dev_err(dev, "rtc can't support %04d year\n",
					year + 2000);
			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);

	if (s3c_rtc_cpu_type == TYPE_EXYNOS) {
		year = (((year / 100) << 8) + (((year % 100) / 10) << 4) + year % 10);
		writew(year, base + S3C2410_RTCYEAR);
	} else {
		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);

	if (s3c_rtc_cpu_type == TYPE_EXYNOS)
		alm_tm->tm_year = readw(base + S3C2410_ALMYEAR) & 0xfff;
	else
		alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);

	alm_tm->tm_year += 100;

	alm_en = readb(base + S3C2410_RTCALM);

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

	pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
		 alm_en,
		 1900 + 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 (alrm->enabled) {
		alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
		alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
		alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
		alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
		alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon) - 1;

		if (s3c_rtc_cpu_type == TYPE_EXYNOS)
			alm_tm->tm_year = bcd2bin(alm_tm->tm_year)
				+ (alm_tm->tm_year >> 8) * 100;
		else
			alm_tm->tm_year = bcd2bin(alm_tm->tm_year);

	} else {
		alm_tm->tm_sec = -1;
		alm_tm->tm_min = -1;
		alm_tm->tm_hour = -1;
		alm_tm->tm_mday = -1;
		alm_tm->tm_mon = -1;
		alm_tm->tm_year = -1;
	}

	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;
	int year = tm->tm_year - 100;

	pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
		 alrm->enabled,
		 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
		 tm->tm_hour, tm->tm_min, tm->tm_sec);

	if (year < 0 || year >= 100) {
		if (!(s3c_rtc_cpu_type == TYPE_EXYNOS
					&& year >= 100 && year < 1000)) {
			dev_err(dev, "rtc can't support %04d year\n",
					2000 + year);
			return -EINVAL;
		}
	}

	alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;

	if (alrm->enabled) {
		writeb(~S3C2410_RTCALM_ALL, base + S3C2410_RTCALM);

		writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
		writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
		writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
		writeb(bin2bcd(tm->tm_mday), base + S3C2410_ALMDATE);
		writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_ALMMON);

		if (s3c_rtc_cpu_type == TYPE_EXYNOS) {
			year = (((year / 100) << 8) + (((year % 100) / 10) << 4) + year % 10);
			writew(year, base + S3C2410_ALMYEAR);
		} else {
			writeb(bin2bcd(year), base + S3C2410_ALMYEAR);
		}

		writeb(S3C2410_RTCALM_ALL, base + S3C2410_RTCALM);

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

	if (alrm->enabled != alrm_en)
		s3c_rtc_setaie(dev, alrm->enabled);

	return 0;
}

static const struct rtc_class_ops s3c_rtcops = {
	.read_time	= s3c_rtc_gettime,
	.set_time	= s3c_rtc_settime,
	.read_alarm	= s3c_rtc_getalarm,
	.set_alarm	= s3c_rtc_setalarm,
	.alarm_irq_enable = s3c_rtc_setaie,
};

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 = readw(base + S3C2410_RTCCON);
		if (s3c_rtc_cpu_type != TYPE_S3C2410)
			tmp &= ~S3C64XX_RTCCON_TICEN;
		tmp &= ~S3C2410_RTCCON_RTCEN;
		writew(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 ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
			dev_info(&pdev->dev, "rtc disabled, re-enabling\n");

			tmp = readw(base + S3C2410_RTCCON);
			writew(tmp | S3C2410_RTCCON_RTCEN,
				base + S3C2410_RTCCON);
		}

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

			tmp = readw(base + S3C2410_RTCCON);
			writew(tmp & ~S3C2410_RTCCON_CNTSEL,
				base + S3C2410_RTCCON);
		}

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

			tmp = readw(base + S3C2410_RTCCON);
			writew(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);

	free_irq(s3c_rtc_alarmno, rtc);

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

	s3c_rtc_setaie(&dev->dev, 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 rtc_time rtc_tm;
	struct resource *res;
	int ret;

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

	/* find the IRQs */

	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: alarm irq %d\n", 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,
					 resource_size(res),
					 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, resource_size(res));
	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",
		 readw(s3c_rtc_base + S3C2410_RTCCON));

	device_init_wakeup(&pdev->dev, 1);

	/* Check RTC Time */

	s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;

	s3c_rtc_gettime(NULL, &rtc_tm);

	if (rtc_valid_tm(&rtc_tm)) {
		rtc_tm.tm_year	= 100;
		rtc_tm.tm_mon	= 0;
		rtc_tm.tm_mday	= 1;
		rtc_tm.tm_hour	= 0;
		rtc_tm.tm_min	= 0;
		rtc_tm.tm_sec	= 0;

		s3c_rtc_settime(NULL, &rtc_tm);

		dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
	}

	/* 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;
	}

	if (s3c_rtc_cpu_type != TYPE_S3C2410)
		rtc->max_user_freq = 32768;
	else
		rtc->max_user_freq = 128;

	platform_set_drvdata(pdev, rtc);

	ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
			  IRQF_DISABLED,  "s3c2410-rtc alarm", rtc);
	if (ret) {
		dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
		goto err_irq;
	}

	return 0;

 err_irq:
	rtc_device_unregister(rtc);

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

 err_clk:
	iounmap(s3c_rtc_base);

 err_nomap:
	release_mem_region(res->start, resource_size(res));
	release_resource(s3c_rtc_mem);

 err_nores:
	return ret;
}

#ifdef CONFIG_PM

/* RTC Power management control */

static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
{
	s3c_rtc_enable(pdev, 0);

	if (device_may_wakeup(&pdev->dev) && !wake_en) {
		if (enable_irq_wake(s3c_rtc_alarmno) == 0)
			wake_en = true;
		else
			dev_err(&pdev->dev, "enable_irq_wake failed\n");
	}

	return 0;
}

static int s3c_rtc_resume(struct platform_device *pdev)
{
	s3c_rtc_enable(pdev, 1);

	if (device_may_wakeup(&pdev->dev) && wake_en) {
		disable_irq_wake(s3c_rtc_alarmno);
		wake_en = false;
	}

	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,
	}, {
		.name		= "exynos-rtc",
		.driver_data	= TYPE_EXYNOS,
	},
	{ }
};

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");