marvell/linux/drivers/rtc/rtc-scs.c

/*
 * Base driver for ASR SCS RTC
 *
 * Copyright 2020 ASR Microelectronics (Shanghai) Co., Ltd.
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/mfd/core.h>
#include <linux/mfd/88pm80x.h>
#include <linux/mfd/pm803.h>
#include <linux/mfd/pm802.h>
#include <linux/mfd/pm813.h>
#include <linux/rtc.h>
#include <linux/reboot.h>
#include <linux/sysfs.h>
#include <soc/asr/addr-map.h>
#include <linux/cputype.h>

#ifdef CONFIG_CPU_ASR1903
#define SCS_RTC_FREQ	 (32765)
#else
#define SCS_RTC_FREQ	 (32787)
#endif

#define SCS_RTC_COUNTR			(0x0)
#define SCS_RTC_ALARM			(0x4)
#define SCS_RTC_TRIM			(0x8)
#define SCS_RTC_ALARM_EN		(0x1 << 0)
#define SCS_RTC_ALARM_MASK		(0x1 << 0)
#define SCS_RTC_ALARM_CLR		(0x1 << 1)
#define SCS_RTC_CNTL			(0xc)
#define SCS_IDAC_CODE			(0x10)
#define SCS_RTC_SYNC_CFG		(0x14)
#define SCS_DCS_MODE			(0x1c)
#define SCS_CLEAR_SYNC_DONE		(0x1 << 0 | 0x1 << 6)
#define SCS_SYNC_IDAC_CODE		(0x1 << 0 | 0x1 << 5)
#define SCS_SYNC_RTC_CNRL		(0x1 << 0 | 0x1 << 4)
#define SCS_SYNC_RTC_TRIM		(0x1 << 0 | 0x1 << 3)
#define SCS_SYNC_RTC_ALARM		(0x1 << 0 | 0x1 << 2)
#define SCS_SYNC_RTC_ALARM_CNTL		(0x1 << 0 | 0x1 << 2 | 0x1 << 4)
#define SCS_SYNC_RTC_COUNTER		(0x1 << 0 | 0x1 << 1)
#define SCS_RTC_VIRT_BASE		(APB_VIRT_BASE + 0x03E000)
#define ASR1903_SCS_RTC_VIRT_BASE	(APB_VIRT_BASE + 0x0C0000)

#define SCR_RTC_SYNC_UDELAY		(130)

struct scs_rtc_info {
	spinlock_t		lock;
	void __iomem		*base;
	struct pm80x_chip *chip;
	struct regmap *map;
	struct rtc_device *rtc_dev;
	struct device *dev;
	int irq;
	int vrtc;
	int (*sync) (s64 ticks);

#ifdef CONFIG_RTC_DRV_SA1100
	struct delayed_work sa1100_sync_work;
#endif
};

static s64 base_ticks;
#ifdef CONFIG_RTC_DRV_SA1100
extern int sync_time_to_soc(s64 ticks);
#endif
static int scs_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled);

#ifdef CONFIG_RTC_DRV_SA1100
static int scs_rtc_read_time(struct device *dev, struct rtc_time *tm);
static void sa1100_sync_fn(struct work_struct *work)
{
	struct scs_rtc_info *info =
		container_of(work, struct scs_rtc_info, sa1100_sync_work.work);
	s64 ticks;
	struct rtc_time tm;
	int ret;

	ret = scs_rtc_read_time(info->dev, &tm);
	if (ret < 0) {
		dev_err(info->dev, "Failed to read time.\n");
		return;
	}

	ticks = rtc_tm_to_time64(&tm);
	if (info->sync)
		info->sync(ticks);
}
#endif

static int pm80x_write_base_ticks(struct scs_rtc_info *info, s64 base_ticks)
{
	u8 buf[5];
	u32 reg = PM802_RTC_EXPIRE2_1;

	BUG_ON(CHIP_PM801 == info->chip->type);
	buf[0] = base_ticks & 0xFF;
	buf[1] = (base_ticks >> 8) & 0xFF;
	buf[2] = (base_ticks >> 16) & 0xFF;
	buf[3] = (base_ticks >> 24) & 0xFF;
	buf[4] = (base_ticks >> 32) & 0xFF;
	dev_dbg(info->dev, "set base ticks:0x%llx\n", base_ticks);

	if (CHIP_PM803 != info->chip->type) {
		regmap_raw_write(info->map, reg, buf, 4);
	}

	if (CHIP_PM802 == info->chip->type) {
		if (CHIP_PM802_ID_B1 == info->chip->chip_id ||
			CHIP_PM802_ID_B0 == info->chip->chip_id) {
			regmap_raw_read(info->map, PM802_RTC_MISC14, buf, 1);
			buf[0] &= 0x0f;
			buf[0] |= ((buf[4] & 0xf) << 4);			
			/* F1[7:4] */
			regmap_raw_write(info->map, PM802_RTC_MISC14, &buf[0], 1);
		} else {
			/* CD[7:0] */
			regmap_raw_write(info->map, PM802S_RTC_SPARED, &buf[4], 1);
		}
	} else if (CHIP_PM803 == info->chip->type) {
		regmap_raw_write(info->map, PM803_RTC_MISC18, &buf[0], 3);
		regmap_raw_write(info->map, PM803_RTC_SPARE5, &buf[3], 2);
	} else if (CHIP_PM813 == info->chip->type) {
		if (CHIP_PM813_ID == info->chip->chip_id) {
			/* F6[7:0] */
			regmap_raw_write(info->map, PM813_RTC_MISC19, &buf[4], 1);
		} else {
			/* CD[7:0] */
			regmap_raw_write(info->map, PM813S_RTC_SPARED, &buf[4], 1);
		}
	} else {
		BUG();
	}

	return 0;
}

static int pm80x_read_base_ticks(struct scs_rtc_info *info, s64 *base_ticks)
{
	u8 buf[5];
	u32 reg = PM802_RTC_EXPIRE2_1;

	BUG_ON(CHIP_PM801 == info->chip->type);

	if (CHIP_PM803 != info->chip->type) {
		regmap_raw_read(info->map, reg, buf, 4);
	}

	if (CHIP_PM802 == info->chip->type) {
		if (CHIP_PM802_ID_B1 == info->chip->chip_id ||
			CHIP_PM802_ID_B0 == info->chip->chip_id) {
			/* F1[7:4] */
			regmap_raw_read(info->map, PM802_RTC_MISC14, &buf[4], 1);
			buf[4] = (buf[4] >> 4) & 0xf;
		} else {
			/* CD[7:0] */
			regmap_raw_read(info->map, PM802S_RTC_SPARED, &buf[4], 1);
		}
	} else if (CHIP_PM803 == info->chip->type) {
		regmap_raw_read(info->map, PM803_RTC_MISC18, &buf[0], 3);
		regmap_raw_read(info->map, PM803_RTC_SPARE5, &buf[3], 2);
	} else if (CHIP_PM813 == info->chip->type) {
		if (CHIP_PM813_ID == info->chip->chip_id) {
			/* F6[7:0] */
			regmap_raw_read(info->map, PM813_RTC_MISC19, &buf[4], 1);
		} else {
			/* CD[7:0] */
			regmap_raw_read(info->map, PM813S_RTC_SPARED, &buf[4], 1);
		}
	}

	*base_ticks = (((s64)buf[4]) << 60) >> 28;
	*base_ticks |= (((u32)buf[3]) << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];

	dev_dbg(info->dev, "%x-%x-%x-%x-%x, base_ticks: %llx\n",
		buf[0], buf[1], buf[2], buf[3], buf[4], *base_ticks);

	return 0;
}

static int scs_rtc_alarm_clear(struct device *dev)
{
	struct scs_rtc_info *info = dev_get_drvdata(dev);
	int ret = 0;
	unsigned long flags;

	spin_lock_irqsave(&info->lock, flags);
	writel(readl(info->base + SCS_RTC_CNTL) | SCS_RTC_ALARM_CLR,
			info->base + SCS_RTC_CNTL);
	writel(SCS_SYNC_RTC_CNRL, info->base + SCS_RTC_SYNC_CFG);
	udelay(SCR_RTC_SYNC_UDELAY);
	writel(SCS_CLEAR_SYNC_DONE, info->base + SCS_RTC_SYNC_CFG);
	spin_unlock_irqrestore(&info->lock, flags);

	return ret;
}

static int scs_rtc_update_trim(struct device *dev)
{
	struct scs_rtc_info *info = dev_get_drvdata(dev);
	int ret = 0;
	unsigned long flags;

	spin_lock_irqsave(&info->lock, flags);
	if (cpu_is_asr1803_a0())
		writel(0xffff, info->base + SCS_RTC_TRIM);
	else
		writel((SCS_RTC_FREQ - 1), info->base + SCS_RTC_TRIM);
	writel(SCS_SYNC_RTC_TRIM, info->base + SCS_RTC_SYNC_CFG);
	udelay(SCR_RTC_SYNC_UDELAY);
	writel(SCS_CLEAR_SYNC_DONE, info->base + SCS_RTC_SYNC_CFG);

	if (cpu_is_asr1903()) {
		writel(0x14, info->base + SCS_IDAC_CODE);
		writel(SCS_SYNC_IDAC_CODE, info->base + SCS_RTC_SYNC_CFG);
		udelay(SCR_RTC_SYNC_UDELAY);
		writel(SCS_CLEAR_SYNC_DONE, info->base + SCS_RTC_SYNC_CFG);
	}
	spin_unlock_irqrestore(&info->lock, flags);

	return ret;
}

static irqreturn_t rtc_update_handler(int irq, void *data)
{
	struct scs_rtc_info *info = (struct scs_rtc_info *)data;

	scs_rtc_alarm_clear(info->dev);
	rtc_update_irq(info->rtc_dev, 1, RTC_AF);
	return IRQ_HANDLED;
}

static int scs_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	unsigned long time_sec;
	u64 tmp_sec;
	u32 val1, val2;
	s64 ticks;
	struct scs_rtc_info *info = dev_get_drvdata(dev);

	do {
		val1 = readl(info->base + SCS_RTC_COUNTR);
		val2 = readl(info->base + SCS_RTC_COUNTR);
	} while (val2 != val1);

	if (cpu_is_asr1803_a0()) {
		tmp_sec = ((u64)val1) * 261993;
		do_div(tmp_sec, (3 * 128 * 1024));
		time_sec = (u32)tmp_sec;
	} else {
		time_sec = val1;
	}

	pm80x_read_base_ticks(info, &base_ticks);
	ticks = time_sec + base_ticks;
	rtc_time64_to_tm(ticks, tm);

	return 0;
}

static int scs_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	unsigned long time;
	u64 tmp_sec;
	s64 ticks;
	u32 val1, val2;
	struct scs_rtc_info *info = dev_get_drvdata(dev);
	int ret = 0;
	unsigned long flags;
	// Add by mbtk
	struct timespec64 ts;

	if ((tm->tm_year < 70) || (tm->tm_year > 300)) {
		dev_err(info->dev,
			"SCSRTC: Set time %d out of range. Please set time between 1970 to 2200.\n",
			1900 + tm->tm_year);
		return -EINVAL;
	}

	spin_lock_irqsave(&info->lock, flags);
	// Add by mbtk
	ktime_get_real_ts64(&ts);
	rtc_time_to_tm(ts.tv_sec - sys_tz.tz_minuteswest * 60, tm);
	ticks = rtc_tm_to_time64(tm);
	do {
		val1 = readl(info->base + SCS_RTC_COUNTR);
		val2 = readl(info->base + SCS_RTC_COUNTR);
	} while (val2 != val1);

	if (cpu_is_asr1803_a0()) {
		tmp_sec = ((u64)val1) * 261993;
		do_div(tmp_sec, (3 * 128 * 1024));
		time = (u32)tmp_sec;
	} else {
		time = val1;
	}

	base_ticks = ticks - time;
	spin_unlock_irqrestore(&info->lock, flags);
	pm80x_write_base_ticks(info, base_ticks);
	spin_lock_irqsave(&info->lock, flags);
#if 0
	if (cpu_is_asr1803_a0()) {
		tmp_sec = ((u64)time) * (3 * 128 * 1024);
		do_div(tmp_sec, 261993);
		time = (unsigned long)tmp_sec;
	}
	writel(time, info->base + SCS_RTC_COUNTR);

	writel(SCS_SYNC_RTC_COUNTER, info->base + SCS_RTC_SYNC_CFG);
	udelay(SCR_RTC_SYNC_UDELAY);
	writel(SCS_CLEAR_SYNC_DONE, info->base + SCS_RTC_SYNC_CFG);
#endif
	if (info->sync)
		info->sync(ticks);
	spin_unlock_irqrestore(&info->lock, flags);

	return ret;
}

static int scs_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	unsigned long ticks;
	u64 tmp_sec;
	s64 time;
	struct scs_rtc_info *info = dev_get_drvdata(dev);

	ticks = readl(info->base + SCS_RTC_ALARM);
	if (cpu_is_asr1803_a0()) {
		tmp_sec = ((u64)ticks) * 261993;
		do_div(tmp_sec, (3 * 128 * 1024));
		ticks = (u32)tmp_sec;
	}

	pm80x_read_base_ticks(info, &base_ticks);
	time = ticks + base_ticks;

	rtc_time64_to_tm(time, &alrm->time);
	ticks = readl(info->base + SCS_RTC_CNTL);
	alrm->enabled = ((ticks & SCS_RTC_ALARM_MASK) == SCS_RTC_ALARM_EN) ? 1 : 0;
	alrm->pending = 0;
	return 0;
}

static int scs_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct scs_rtc_info *info = dev_get_drvdata(dev);
	unsigned long flags;
	u64 tmp_sec;
	s64 ticks;
	u32 time;

	ticks = rtc_tm_to_time64(&alrm->time);
	pm80x_read_base_ticks(info, &base_ticks);
	ticks = ticks - base_ticks;
	if (cpu_is_asr1803_a0()) {
		tmp_sec = ((u64)ticks) * (3 * 128 * 1024);
		//time = tmp_sec / 261993;
		do_div(tmp_sec, 261993);
		time = (u32)tmp_sec;
	} else {
		time = (u32)ticks;
	}

	spin_lock_irqsave(&info->lock, flags);
	writel(time, info->base + SCS_RTC_ALARM);
	writel(SCS_SYNC_RTC_ALARM_CNTL, info->base + SCS_RTC_SYNC_CFG);
	udelay(SCR_RTC_SYNC_UDELAY);
	writel(SCS_CLEAR_SYNC_DONE, info->base + SCS_RTC_SYNC_CFG);
	spin_unlock_irqrestore(&info->lock, flags);
	scs_rtc_alarm_irq_enable(dev, alrm->enabled);
	return 0;
}

static int scs_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct scs_rtc_info *info = dev_get_drvdata(dev);
	int ret = 0;
	unsigned long flags;

	spin_lock_irqsave(&info->lock, flags);
	if (enabled)
		writel(readl(info->base + SCS_RTC_CNTL) | SCS_RTC_ALARM_MASK,
			info->base + SCS_RTC_CNTL);
	else
		writel(readl(info->base + SCS_RTC_CNTL) & (~SCS_RTC_ALARM_MASK),
			info->base + SCS_RTC_CNTL);
	writel(SCS_SYNC_RTC_CNRL, info->base + SCS_RTC_SYNC_CFG);
	udelay(SCR_RTC_SYNC_UDELAY);
	writel(SCS_CLEAR_SYNC_DONE, info->base + SCS_RTC_SYNC_CFG);
	spin_unlock_irqrestore(&info->lock, flags);

	return ret;
}

static const struct rtc_class_ops scs_rtc_ops = {
	.read_time = scs_rtc_read_time,
	.set_time = scs_rtc_set_time,
	.read_alarm = scs_rtc_read_alarm,
	.set_alarm = scs_rtc_set_alarm,
	.alarm_irq_enable = scs_rtc_alarm_irq_enable,
};

#ifdef CONFIG_PM_SLEEP
static int scs_rtc_suspend(struct device *dev)
{
	return pm80x_dev_suspend(dev);
}

static int scs_rtc_resume(struct device *dev)
{
	return pm80x_dev_resume(dev);
}
#endif

static SIMPLE_DEV_PM_OPS(scs_rtc_pm_ops, scs_rtc_suspend, scs_rtc_resume);

static struct delayed_work sync_work;
static unsigned int print_tstamp_delay = 30;
static void sync_timestamp(struct work_struct *work)
{
	struct timespec64 ts;
	struct rtc_time tm;

	ktime_get_real_ts64(&ts);
	rtc_time64_to_tm(ts.tv_sec - sys_tz.tz_minuteswest * 60, &tm);
	pr_info("Timestamp is: %02d-%02d %02d:%02d:%02d.%03lu UTC\n",
		tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min,
		tm.tm_sec, ts.tv_nsec);
	/* print timestamp every 30 minutes */
	schedule_delayed_work(&sync_work, print_tstamp_delay*60*HZ);
}

#ifdef CONFIG_SYSFS
static ssize_t tstamp_show_delay(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%u\n", print_tstamp_delay);
}
static ssize_t tstamp_store_delay(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t size)
{
	char *end;
	unsigned long new = simple_strtoul(buf, &end, 0);
	if (end == buf)
		return -EINVAL;
	print_tstamp_delay = new;
	cancel_delayed_work(&sync_work);
	schedule_delayed_work(&sync_work, print_tstamp_delay*60*HZ);
	return size;
}
static DEVICE_ATTR(tstamp_delay, 0664, tstamp_show_delay, tstamp_store_delay);

static int add_tstamp_delay(struct device *dev)
{
	return device_create_file(dev, &dev_attr_tstamp_delay);
}

static void remove_tstamp_delay(struct device *dev)
{
	device_remove_file(dev, &dev_attr_tstamp_delay);
}

#else
#define add_tstamp_delay(dev) 0
#define remove_tstamp_delay(dev) do {} while (0)
#endif /* CONFIG_SYSFS */

static int scs_rtc_probe(struct platform_device *pdev)
{
	struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm80x_rtc_pdata *pdata = NULL;
	struct scs_rtc_info *info;
	struct rtc_time tm;
	int ret;

	if (cpu_is_asr1803_z1())
		return -ENODEV;

	INIT_DEFERRABLE_WORK(&sync_work, sync_timestamp);
	schedule_delayed_work(&sync_work, 1*60*HZ);
	add_tstamp_delay(&pdev->dev);

	pdata = pdev->dev.platform_data;
	if (IS_ENABLED(CONFIG_OF)) {
		if (!pdata) {
			pdata = devm_kzalloc(&pdev->dev,
					     sizeof(*pdata), GFP_KERNEL);
			if (!pdata)
				return -ENOMEM;
		}
	} else if (!pdata) {
		return -EINVAL;
	}

	info =
	    devm_kzalloc(&pdev->dev, sizeof(struct scs_rtc_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	info->irq = platform_get_irq(pdev, 0);
	if (info->irq < 0) {
		dev_err(&pdev->dev, "No IRQ resource!\n");
		ret = -EINVAL;
		goto out;
	}

	info->chip = chip;
	info->map = chip->regmap;
	if (!info->map) {
		dev_err(&pdev->dev, "no regmap!\n");
		ret = -EINVAL;
		goto out;
	}
	if (cpu_is_asr1903())
		info->base = ASR1903_SCS_RTC_VIRT_BASE;
	else
		info->base = SCS_RTC_VIRT_BASE;
	spin_lock_init(&info->lock);

	info->dev = &pdev->dev;
	dev_set_drvdata(&pdev->dev, info);

	scs_rtc_alarm_clear(&pdev->dev);
	scs_rtc_update_trim(&pdev->dev);
	scs_rtc_alarm_irq_enable(&pdev->dev, 0);
	ret = scs_rtc_read_time(&pdev->dev, &tm);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to read initial time.\n");
		goto out;
	}

	if ((tm.tm_year < 70) || (tm.tm_year > 1157)) {
		tm.tm_year = 70;
		tm.tm_mon = 0;
		tm.tm_mday = 1;
		tm.tm_hour = 0;
		tm.tm_min = 0;
		tm.tm_sec = 0;
		ret = scs_rtc_set_time(&pdev->dev, &tm);
		if (ret < 0) {
			dev_err(&pdev->dev, "Failed to set initial time.\n");
			goto out;
		}
	}

	info->sync = NULL; /*initialize*/
#ifdef CONFIG_RTC_DRV_SA1100
	info->sync = sync_time_to_soc;
	INIT_DELAYED_WORK(&info->sa1100_sync_work, sa1100_sync_fn);
	schedule_delayed_work(&info->sa1100_sync_work, 2 * HZ);
#endif

	dev_info(&pdev->dev, "%d-%d-%d-->%d: %d: %d\n",
	 tm.tm_year, tm.tm_mon, tm.tm_mday,
	 tm.tm_hour, tm.tm_min, tm.tm_sec);

	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "scs-rtc",
					    &scs_rtc_ops, THIS_MODULE);
	if (IS_ERR(info->rtc_dev)) {
		ret = PTR_ERR(info->rtc_dev);
		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
		goto out;
	}

	/* remeber whether this power up is caused by PMIC RTC or not. */
	info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup;
	ret = pm80x_request_irq(chip, info->irq, rtc_update_handler,
				IRQF_ONESHOT | IRQF_NO_SUSPEND , "rtc", info);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
			info->irq, ret);
		goto out;
	}

	BUG_ON((CHIP_PM801 == info->chip->type) || (CHIP_PM800 == info->chip->type));

	device_init_wakeup(&pdev->dev, 1);

	return 0;
out:
	return ret;
}

static int scs_rtc_remove(struct platform_device *pdev)
{
	struct scs_rtc_info *info = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);
	pm80x_free_irq(info->chip, info->irq, info);
	remove_tstamp_delay(&pdev->dev);
	return 0;
}

static void scs_rtc_shutdown(struct platform_device *pdev)
{
	struct timespec64 now;
	struct rtc_time tm;
	struct scs_rtc_info *info = platform_get_drvdata(pdev);

	/* sync timekeeping time to pmic rtc */
	ktime_get_real_ts64(&now);
	if (now.tv_nsec < (NSEC_PER_SEC >> 1))
		rtc_time64_to_tm(now.tv_sec, &tm);
	else
		rtc_time64_to_tm(now.tv_sec + 1, &tm);
	scs_rtc_set_time(info->dev, &tm);
	pm80x_free_irq(info->chip, info->irq, info);
}

static struct platform_driver scs_rtc_driver = {
	.driver = {
		   .name = "scs-rtc",
		   .owner = THIS_MODULE,
		   .pm = &scs_rtc_pm_ops,
		   },
	.probe = scs_rtc_probe,
	.remove = scs_rtc_remove,
	.shutdown = scs_rtc_shutdown,
};

static int __init scs_rtc_init(void)
{
	return platform_driver_register(&scs_rtc_driver);
}
module_init(scs_rtc_init);

static void __exit scs_rtc_exit(void)
{
	platform_driver_unregister(&scs_rtc_driver);
}
module_exit(scs_rtc_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ASR PM803 and SCS RTC driver");