[mirror_ubuntu-zesty-kernel.git] / drivers / rtc / rtc-mxc.c

/*
 * Copyright 2004-2008 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/io.h>
#include <linux/rtc.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/clk.h>

#define RTC_INPUT_CLK_32768HZ	(0x00 << 5)
#define RTC_INPUT_CLK_32000HZ	(0x01 << 5)
#define RTC_INPUT_CLK_38400HZ	(0x02 << 5)

#define RTC_SW_BIT      (1 << 0)
#define RTC_ALM_BIT     (1 << 2)
#define RTC_1HZ_BIT     (1 << 4)
#define RTC_2HZ_BIT     (1 << 7)
#define RTC_SAM0_BIT    (1 << 8)
#define RTC_SAM1_BIT    (1 << 9)
#define RTC_SAM2_BIT    (1 << 10)
#define RTC_SAM3_BIT    (1 << 11)
#define RTC_SAM4_BIT    (1 << 12)
#define RTC_SAM5_BIT    (1 << 13)
#define RTC_SAM6_BIT    (1 << 14)
#define RTC_SAM7_BIT    (1 << 15)
#define PIT_ALL_ON      (RTC_2HZ_BIT | RTC_SAM0_BIT | RTC_SAM1_BIT | \
			 RTC_SAM2_BIT | RTC_SAM3_BIT | RTC_SAM4_BIT | \
			 RTC_SAM5_BIT | RTC_SAM6_BIT | RTC_SAM7_BIT)

#define RTC_ENABLE_BIT  (1 << 7)

#define MAX_PIE_NUM     9
#define MAX_PIE_FREQ    512
static const u32 PIE_BIT_DEF[MAX_PIE_NUM][2] = {
	{ 2,		RTC_2HZ_BIT },
	{ 4,		RTC_SAM0_BIT },
	{ 8,		RTC_SAM1_BIT },
	{ 16,		RTC_SAM2_BIT },
	{ 32,		RTC_SAM3_BIT },
	{ 64,		RTC_SAM4_BIT },
	{ 128,		RTC_SAM5_BIT },
	{ 256,		RTC_SAM6_BIT },
	{ MAX_PIE_FREQ,	RTC_SAM7_BIT },
};

#define MXC_RTC_TIME	0
#define MXC_RTC_ALARM	1

#define RTC_HOURMIN	0x00	/*  32bit rtc hour/min counter reg */
#define RTC_SECOND	0x04	/*  32bit rtc seconds counter reg */
#define RTC_ALRM_HM	0x08	/*  32bit rtc alarm hour/min reg */
#define RTC_ALRM_SEC	0x0C	/*  32bit rtc alarm seconds reg */
#define RTC_RTCCTL	0x10	/*  32bit rtc control reg */
#define RTC_RTCISR	0x14	/*  32bit rtc interrupt status reg */
#define RTC_RTCIENR	0x18	/*  32bit rtc interrupt enable reg */
#define RTC_STPWCH	0x1C	/*  32bit rtc stopwatch min reg */
#define RTC_DAYR	0x20	/*  32bit rtc days counter reg */
#define RTC_DAYALARM	0x24	/*  32bit rtc day alarm reg */
#define RTC_TEST1	0x28	/*  32bit rtc test reg 1 */
#define RTC_TEST2	0x2C	/*  32bit rtc test reg 2 */
#define RTC_TEST3	0x30	/*  32bit rtc test reg 3 */

enum imx_rtc_type {
	IMX1_RTC,
	IMX21_RTC,
};

struct rtc_plat_data {
	struct rtc_device *rtc;
	void __iomem *ioaddr;
	int irq;
	struct clk *clk;
	struct rtc_time g_rtc_alarm;
	enum imx_rtc_type devtype;
};

static struct platform_device_id imx_rtc_devtype[] = {
	{
		.name = "imx1-rtc",
		.driver_data = IMX1_RTC,
	}, {
		.name = "imx21-rtc",
		.driver_data = IMX21_RTC,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(platform, imx_rtc_devtype);

static inline int is_imx1_rtc(struct rtc_plat_data *data)
{
	return data->devtype == IMX1_RTC;
}

/*
 * This function is used to obtain the RTC time or the alarm value in
 * second.
 */
static u32 get_alarm_or_time(struct device *dev, int time_alarm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32 day = 0, hr = 0, min = 0, sec = 0, hr_min = 0;

	switch (time_alarm) {
	case MXC_RTC_TIME:
		day = readw(ioaddr + RTC_DAYR);
		hr_min = readw(ioaddr + RTC_HOURMIN);
		sec = readw(ioaddr + RTC_SECOND);
		break;
	case MXC_RTC_ALARM:
		day = readw(ioaddr + RTC_DAYALARM);
		hr_min = readw(ioaddr + RTC_ALRM_HM) & 0xffff;
		sec = readw(ioaddr + RTC_ALRM_SEC);
		break;
	}

	hr = hr_min >> 8;
	min = hr_min & 0xff;

	return (((day * 24 + hr) * 60) + min) * 60 + sec;
}

/*
 * This function sets the RTC alarm value or the time value.
 */
static void set_alarm_or_time(struct device *dev, int time_alarm, u32 time)
{
	u32 day, hr, min, sec, temp;
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;

	day = time / 86400;
	time -= day * 86400;

	/* time is within a day now */
	hr = time / 3600;
	time -= hr * 3600;

	/* time is within an hour now */
	min = time / 60;
	sec = time - min * 60;

	temp = (hr << 8) + min;

	switch (time_alarm) {
	case MXC_RTC_TIME:
		writew(day, ioaddr + RTC_DAYR);
		writew(sec, ioaddr + RTC_SECOND);
		writew(temp, ioaddr + RTC_HOURMIN);
		break;
	case MXC_RTC_ALARM:
		writew(day, ioaddr + RTC_DAYALARM);
		writew(sec, ioaddr + RTC_ALRM_SEC);
		writew(temp, ioaddr + RTC_ALRM_HM);
		break;
	}
}

/*
 * This function updates the RTC alarm registers and then clears all the
 * interrupt status bits.
 */
static void rtc_update_alarm(struct device *dev, struct rtc_time *alrm)
{
	unsigned long time;
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;

	rtc_tm_to_time(alrm, &time);

	/* clear all the interrupt status bits */
	writew(readw(ioaddr + RTC_RTCISR), ioaddr + RTC_RTCISR);
	set_alarm_or_time(dev, MXC_RTC_ALARM, time);
}

static void mxc_rtc_irq_enable(struct device *dev, unsigned int bit,
				unsigned int enabled)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32 reg;

	spin_lock_irq(&pdata->rtc->irq_lock);
	reg = readw(ioaddr + RTC_RTCIENR);

	if (enabled)
		reg |= bit;
	else
		reg &= ~bit;

	writew(reg, ioaddr + RTC_RTCIENR);
	spin_unlock_irq(&pdata->rtc->irq_lock);
}

/* This function is the RTC interrupt service routine. */
static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
{
	struct platform_device *pdev = dev_id;
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;
	unsigned long flags;
	u32 status;
	u32 events = 0;

	spin_lock_irqsave(&pdata->rtc->irq_lock, flags);
	status = readw(ioaddr + RTC_RTCISR) & readw(ioaddr + RTC_RTCIENR);
	/* clear interrupt sources */
	writew(status, ioaddr + RTC_RTCISR);

	/* update irq data & counter */
	if (status & RTC_ALM_BIT) {
		events |= (RTC_AF | RTC_IRQF);
		/* RTC alarm should be one-shot */
		mxc_rtc_irq_enable(&pdev->dev, RTC_ALM_BIT, 0);
	}

	if (status & RTC_1HZ_BIT)
		events |= (RTC_UF | RTC_IRQF);

	if (status & PIT_ALL_ON)
		events |= (RTC_PF | RTC_IRQF);

	rtc_update_irq(pdata->rtc, 1, events);
	spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);

	return IRQ_HANDLED;
}

/*
 * Clear all interrupts and release the IRQ
 */
static void mxc_rtc_release(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;

	spin_lock_irq(&pdata->rtc->irq_lock);

	/* Disable all rtc interrupts */
	writew(0, ioaddr + RTC_RTCIENR);

	/* Clear all interrupt status */
	writew(0xffffffff, ioaddr + RTC_RTCISR);

	spin_unlock_irq(&pdata->rtc->irq_lock);
}

static int mxc_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	mxc_rtc_irq_enable(dev, RTC_ALM_BIT, enabled);
	return 0;
}

/*
 * This function reads the current RTC time into tm in Gregorian date.
 */
static int mxc_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	u32 val;

	/* Avoid roll-over from reading the different registers */
	do {
		val = get_alarm_or_time(dev, MXC_RTC_TIME);
	} while (val != get_alarm_or_time(dev, MXC_RTC_TIME));

	rtc_time_to_tm(val, tm);

	return 0;
}

/*
 * This function sets the internal RTC time based on tm in Gregorian date.
 */
static int mxc_rtc_set_mmss(struct device *dev, unsigned long time)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	/*
	 * TTC_DAYR register is 9-bit in MX1 SoC, save time and day of year only
	 */
	if (is_imx1_rtc(pdata)) {
		struct rtc_time tm;

		rtc_time_to_tm(time, &tm);
		tm.tm_year = 70;
		rtc_tm_to_time(&tm, &time);
	}

	/* Avoid roll-over from reading the different registers */
	do {
		set_alarm_or_time(dev, MXC_RTC_TIME, time);
	} while (time != get_alarm_or_time(dev, MXC_RTC_TIME));

	return 0;
}

/*
 * This function reads the current alarm value into the passed in 'alrm'
 * argument. It updates the alrm's pending field value based on the whether
 * an alarm interrupt occurs or not.
 */
static int mxc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;

	rtc_time_to_tm(get_alarm_or_time(dev, MXC_RTC_ALARM), &alrm->time);
	alrm->pending = ((readw(ioaddr + RTC_RTCISR) & RTC_ALM_BIT)) ? 1 : 0;

	return 0;
}

/*
 * This function sets the RTC alarm based on passed in alrm.
 */
static int mxc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	rtc_update_alarm(dev, &alrm->time);

	memcpy(&pdata->g_rtc_alarm, &alrm->time, sizeof(struct rtc_time));
	mxc_rtc_irq_enable(dev, RTC_ALM_BIT, alrm->enabled);

	return 0;
}

/* RTC layer */
static struct rtc_class_ops mxc_rtc_ops = {
	.release		= mxc_rtc_release,
	.read_time		= mxc_rtc_read_time,
	.set_mmss		= mxc_rtc_set_mmss,
	.read_alarm		= mxc_rtc_read_alarm,
	.set_alarm		= mxc_rtc_set_alarm,
	.alarm_irq_enable	= mxc_rtc_alarm_irq_enable,
};

static int mxc_rtc_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct rtc_device *rtc;
	struct rtc_plat_data *pdata = NULL;
	u32 reg;
	unsigned long rate;
	int ret;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	pdata->devtype = pdev->id_entry->driver_data;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(pdata->ioaddr))
		return PTR_ERR(pdata->ioaddr);

	pdata->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(pdata->clk)) {
		dev_err(&pdev->dev, "unable to get clock!\n");
		return PTR_ERR(pdata->clk);
	}

	ret = clk_prepare_enable(pdata->clk);
	if (ret)
		return ret;

	rate = clk_get_rate(pdata->clk);

	if (rate == 32768)
		reg = RTC_INPUT_CLK_32768HZ;
	else if (rate == 32000)
		reg = RTC_INPUT_CLK_32000HZ;
	else if (rate == 38400)
		reg = RTC_INPUT_CLK_38400HZ;
	else {
		dev_err(&pdev->dev, "rtc clock is not valid (%lu)\n", rate);
		ret = -EINVAL;
		goto exit_put_clk;
	}

	reg |= RTC_ENABLE_BIT;
	writew(reg, (pdata->ioaddr + RTC_RTCCTL));
	if (((readw(pdata->ioaddr + RTC_RTCCTL)) & RTC_ENABLE_BIT) == 0) {
		dev_err(&pdev->dev, "hardware module can't be enabled!\n");
		ret = -EIO;
		goto exit_put_clk;
	}

	platform_set_drvdata(pdev, pdata);

	/* Configure and enable the RTC */
	pdata->irq = platform_get_irq(pdev, 0);

	if (pdata->irq >= 0 &&
	    devm_request_irq(&pdev->dev, pdata->irq, mxc_rtc_interrupt,
			     IRQF_SHARED, pdev->name, pdev) < 0) {
		dev_warn(&pdev->dev, "interrupt not available.\n");
		pdata->irq = -1;
	}

	if (pdata->irq >= 0)
		device_init_wakeup(&pdev->dev, 1);

	rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &mxc_rtc_ops,
				  THIS_MODULE);
	if (IS_ERR(rtc)) {
		ret = PTR_ERR(rtc);
		goto exit_put_clk;
	}

	pdata->rtc = rtc;

	return 0;

exit_put_clk:
	clk_disable_unprepare(pdata->clk);

	return ret;
}

static int mxc_rtc_remove(struct platform_device *pdev)
{
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	clk_disable_unprepare(pdata->clk);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int mxc_rtc_suspend(struct device *dev)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(pdata->irq);

	return 0;
}

static int mxc_rtc_resume(struct device *dev)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(pdata->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(mxc_rtc_pm_ops, mxc_rtc_suspend, mxc_rtc_resume);

static struct platform_driver mxc_rtc_driver = {
	.driver = {
		   .name	= "mxc_rtc",
		   .pm		= &mxc_rtc_pm_ops,
	},
	.id_table = imx_rtc_devtype,
	.probe = mxc_rtc_probe,
	.remove = mxc_rtc_remove,
};

module_platform_driver(mxc_rtc_driver)

MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("RTC driver for Freescale MXC");
MODULE_LICENSE("GPL");
Commit	Line	Data
d00ed3cf DM	1	/*
	2	* Copyright 2004-2008 Freescale Semiconductor, Inc. All Rights Reserved.
	3	*
	4	* The code contained herein is licensed under the GNU General Public
	5	* License. You may obtain a copy of the GNU General Public License
	6	* Version 2 or later at the following locations:
	7	*
	8	* http://www.opensource.org/licenses/gpl-license.html
	9	* http://www.gnu.org/copyleft/gpl.html
	10	*/
	11
	12	#include <linux/io.h>
	13	#include <linux/rtc.h>
	14	#include <linux/module.h>
5a0e3ad6	15	#include <linux/slab.h>
d00ed3cf DM	16	#include <linux/interrupt.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/clk.h>
	19
d00ed3cf DM	20	#define RTC_INPUT_CLK_32768HZ (0x00 << 5)
	21	#define RTC_INPUT_CLK_32000HZ (0x01 << 5)
	22	#define RTC_INPUT_CLK_38400HZ (0x02 << 5)
	23
	24	#define RTC_SW_BIT (1 << 0)
	25	#define RTC_ALM_BIT (1 << 2)
	26	#define RTC_1HZ_BIT (1 << 4)
	27	#define RTC_2HZ_BIT (1 << 7)
	28	#define RTC_SAM0_BIT (1 << 8)
	29	#define RTC_SAM1_BIT (1 << 9)
	30	#define RTC_SAM2_BIT (1 << 10)
	31	#define RTC_SAM3_BIT (1 << 11)
	32	#define RTC_SAM4_BIT (1 << 12)
	33	#define RTC_SAM5_BIT (1 << 13)
	34	#define RTC_SAM6_BIT (1 << 14)
	35	#define RTC_SAM7_BIT (1 << 15)
	36	#define PIT_ALL_ON (RTC_2HZ_BIT \| RTC_SAM0_BIT \| RTC_SAM1_BIT \| \
	37	RTC_SAM2_BIT \| RTC_SAM3_BIT \| RTC_SAM4_BIT \| \
	38	RTC_SAM5_BIT \| RTC_SAM6_BIT \| RTC_SAM7_BIT)
	39
	40	#define RTC_ENABLE_BIT (1 << 7)
	41
	42	#define MAX_PIE_NUM 9
	43	#define MAX_PIE_FREQ 512
	44	static const u32 PIE_BIT_DEF[MAX_PIE_NUM][2] = {
	45	{ 2, RTC_2HZ_BIT },
	46	{ 4, RTC_SAM0_BIT },
	47	{ 8, RTC_SAM1_BIT },
	48	{ 16, RTC_SAM2_BIT },
	49	{ 32, RTC_SAM3_BIT },
	50	{ 64, RTC_SAM4_BIT },
	51	{ 128, RTC_SAM5_BIT },
	52	{ 256, RTC_SAM6_BIT },
	53	{ MAX_PIE_FREQ, RTC_SAM7_BIT },
	54	};
	55
d00ed3cf DM	56	#define MXC_RTC_TIME 0
	57	#define MXC_RTC_ALARM 1
	58
	59	#define RTC_HOURMIN 0x00 /* 32bit rtc hour/min counter reg */
	60	#define RTC_SECOND 0x04 /* 32bit rtc seconds counter reg */
	61	#define RTC_ALRM_HM 0x08 /* 32bit rtc alarm hour/min reg */
	62	#define RTC_ALRM_SEC 0x0C /* 32bit rtc alarm seconds reg */
	63	#define RTC_RTCCTL 0x10 /* 32bit rtc control reg */
	64	#define RTC_RTCISR 0x14 /* 32bit rtc interrupt status reg */
	65	#define RTC_RTCIENR 0x18 /* 32bit rtc interrupt enable reg */
	66	#define RTC_STPWCH 0x1C /* 32bit rtc stopwatch min reg */
	67	#define RTC_DAYR 0x20 /* 32bit rtc days counter reg */
	68	#define RTC_DAYALARM 0x24 /* 32bit rtc day alarm reg */
	69	#define RTC_TEST1 0x28 /* 32bit rtc test reg 1 */
	70	#define RTC_TEST2 0x2C /* 32bit rtc test reg 2 */
	71	#define RTC_TEST3 0x30 /* 32bit rtc test reg 3 */
	72
bb1d34a2 SG	73	enum imx_rtc_type {
	74	IMX1_RTC,
	75	IMX21_RTC,
	76	};
	77
d00ed3cf DM	78	struct rtc_plat_data {
	79	struct rtc_device *rtc;
	80	void __iomem *ioaddr;
	81	int irq;
	82	struct clk *clk;
d00ed3cf	83	struct rtc_time g_rtc_alarm;
bb1d34a2	84	enum imx_rtc_type devtype;
d00ed3cf DM	85	};
d00ed3cf DM	86
bb1d34a2 SG	87	static struct platform_device_id imx_rtc_devtype[] = {
	88	{
	89	.name = "imx1-rtc",
	90	.driver_data = IMX1_RTC,
	91	}, {
	92	.name = "imx21-rtc",
	93	.driver_data = IMX21_RTC,
	94	}, {
	95	/* sentinel */
	96	}
	97	};
	98	MODULE_DEVICE_TABLE(platform, imx_rtc_devtype);
	99
	100	static inline int is_imx1_rtc(struct rtc_plat_data *data)
	101	{
	102	return data->devtype == IMX1_RTC;
	103	}
	104
d00ed3cf DM	105	/*
	106	* This function is used to obtain the RTC time or the alarm value in
	107	* second.
	108	*/
	109	static u32 get_alarm_or_time(struct device *dev, int time_alarm)
	110	{
	111	struct platform_device *pdev = to_platform_device(dev);
	112	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	113	void __iomem *ioaddr = pdata->ioaddr;
	114	u32 day = 0, hr = 0, min = 0, sec = 0, hr_min = 0;
	115
	116	switch (time_alarm) {
	117	case MXC_RTC_TIME:
	118	day = readw(ioaddr + RTC_DAYR);
	119	hr_min = readw(ioaddr + RTC_HOURMIN);
	120	sec = readw(ioaddr + RTC_SECOND);
	121	break;
	122	case MXC_RTC_ALARM:
	123	day = readw(ioaddr + RTC_DAYALARM);
	124	hr_min = readw(ioaddr + RTC_ALRM_HM) & 0xffff;
	125	sec = readw(ioaddr + RTC_ALRM_SEC);
	126	break;
	127	}
	128
	129	hr = hr_min >> 8;
	130	min = hr_min & 0xff;
	131
	132	return (((day * 24 + hr) * 60) + min) * 60 + sec;
	133	}
	134
	135	/*
	136	* This function sets the RTC alarm value or the time value.
	137	*/
	138	static void set_alarm_or_time(struct device *dev, int time_alarm, u32 time)
	139	{
	140	u32 day, hr, min, sec, temp;
	141	struct platform_device *pdev = to_platform_device(dev);
	142	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	143	void __iomem *ioaddr = pdata->ioaddr;
	144
	145	day = time / 86400;
	146	time -= day * 86400;
	147
	148	/* time is within a day now */
	149	hr = time / 3600;
	150	time -= hr * 3600;
	151
	152	/* time is within an hour now */
	153	min = time / 60;
	154	sec = time - min * 60;
	155
	156	temp = (hr << 8) + min;
	157
	158	switch (time_alarm) {
	159	case MXC_RTC_TIME:
	160	writew(day, ioaddr + RTC_DAYR);
	161	writew(sec, ioaddr + RTC_SECOND);
	162	writew(temp, ioaddr + RTC_HOURMIN);
	163	break;
	164	case MXC_RTC_ALARM:
	165	writew(day, ioaddr + RTC_DAYALARM);
	166	writew(sec, ioaddr + RTC_ALRM_SEC);
	167	writew(temp, ioaddr + RTC_ALRM_HM);
	168	break;
169	}
170	}
171
172	/*
173	* This function updates the RTC alarm registers and then clears all the
174	* interrupt status bits.
175	*/
482494a8	176	static void rtc_update_alarm(struct device dev, struct rtc_time alrm)
d00ed3cf	177	{
482494a8	178	unsigned long time;
d00ed3cf DM	179	struct platform_device *pdev = to_platform_device(dev);
	180	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	181	void __iomem *ioaddr = pdata->ioaddr;
	182
482494a8	183	rtc_tm_to_time(alrm, &time);
d00ed3cf	184
d00ed3cf DM	185	/* clear all the interrupt status bits */
	186	writew(readw(ioaddr + RTC_RTCISR), ioaddr + RTC_RTCISR);
	187	set_alarm_or_time(dev, MXC_RTC_ALARM, time);
c92182ee YK	188	}
	189
	190	static void mxc_rtc_irq_enable(struct device *dev, unsigned int bit,
	191	unsigned int enabled)
	192	{
	193	struct platform_device *pdev = to_platform_device(dev);
	194	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	195	void __iomem *ioaddr = pdata->ioaddr;
	196	u32 reg;
	197
	198	spin_lock_irq(&pdata->rtc->irq_lock);
	199	reg = readw(ioaddr + RTC_RTCIENR);
	200
	201	if (enabled)
	202	reg \|= bit;
	203	else
	204	reg &= ~bit;
	205
	206	writew(reg, ioaddr + RTC_RTCIENR);
	207	spin_unlock_irq(&pdata->rtc->irq_lock);
d00ed3cf DM	208	}
	209
	210	/* This function is the RTC interrupt service routine. */
	211	static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
	212	{
	213	struct platform_device *pdev = dev_id;
	214	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	215	void __iomem *ioaddr = pdata->ioaddr;
b59f6d1f	216	unsigned long flags;
d00ed3cf DM	217	u32 status;
	218	u32 events = 0;
	219
b59f6d1f	220	spin_lock_irqsave(&pdata->rtc->irq_lock, flags);
d00ed3cf DM	221	status = readw(ioaddr + RTC_RTCISR) & readw(ioaddr + RTC_RTCIENR);
	222	/* clear interrupt sources */
	223	writew(status, ioaddr + RTC_RTCISR);
	224
d00ed3cf	225	/* update irq data & counter */
c92182ee	226	if (status & RTC_ALM_BIT) {
d00ed3cf	227	events \|= (RTC_AF \| RTC_IRQF);
c92182ee YK	228	/* RTC alarm should be one-shot */
	229	mxc_rtc_irq_enable(&pdev->dev, RTC_ALM_BIT, 0);
	230	}
d00ed3cf DM	231
	232	if (status & RTC_1HZ_BIT)
	233	events \|= (RTC_UF \| RTC_IRQF);
	234
	235	if (status & PIT_ALL_ON)
	236	events \|= (RTC_PF \| RTC_IRQF);
	237
d00ed3cf	238	rtc_update_irq(pdata->rtc, 1, events);
b59f6d1f	239	spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);
d00ed3cf DM	240
	241	return IRQ_HANDLED;
	242	}
	243
	244	/*
	245	* Clear all interrupts and release the IRQ
	246	*/
	247	static void mxc_rtc_release(struct device *dev)
	248	{
	249	struct platform_device *pdev = to_platform_device(dev);
	250	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	251	void __iomem *ioaddr = pdata->ioaddr;
	252
	253	spin_lock_irq(&pdata->rtc->irq_lock);
	254
	255	/* Disable all rtc interrupts */
	256	writew(0, ioaddr + RTC_RTCIENR);
	257
	258	/* Clear all interrupt status */
	259	writew(0xffffffff, ioaddr + RTC_RTCISR);
	260
	261	spin_unlock_irq(&pdata->rtc->irq_lock);
	262	}
	263
d00ed3cf DM	264	static int mxc_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	265	{
	266	mxc_rtc_irq_enable(dev, RTC_ALM_BIT, enabled);
	267	return 0;
	268	}
	269
d00ed3cf DM	270	/*
	271	* This function reads the current RTC time into tm in Gregorian date.
	272	*/
	273	static int mxc_rtc_read_time(struct device dev, struct rtc_time tm)
	274	{
	275	u32 val;
	276
	277	/* Avoid roll-over from reading the different registers */
	278	do {
	279	val = get_alarm_or_time(dev, MXC_RTC_TIME);
	280	} while (val != get_alarm_or_time(dev, MXC_RTC_TIME));
	281
	282	rtc_time_to_tm(val, tm);
	283
	284	return 0;
	285	}
	286
	287	/*
	288	* This function sets the internal RTC time based on tm in Gregorian date.
	289	*/
	290	static int mxc_rtc_set_mmss(struct device *dev, unsigned long time)
	291	{
bb1d34a2 SG	292	struct platform_device *pdev = to_platform_device(dev);
	293	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	294
7287be1d YK	295	/*
	296	* TTC_DAYR register is 9-bit in MX1 SoC, save time and day of year only
	297	*/
bb1d34a2	298	if (is_imx1_rtc(pdata)) {
7287be1d YK	299	struct rtc_time tm;
	300
	301	rtc_time_to_tm(time, &tm);
	302	tm.tm_year = 70;
	303	rtc_tm_to_time(&tm, &time);
	304	}
	305
d00ed3cf DM	306	/* Avoid roll-over from reading the different registers */
	307	do {
	308	set_alarm_or_time(dev, MXC_RTC_TIME, time);
	309	} while (time != get_alarm_or_time(dev, MXC_RTC_TIME));
	310
	311	return 0;
	312	}
	313
	314	/*
	315	* This function reads the current alarm value into the passed in 'alrm'
	316	* argument. It updates the alrm's pending field value based on the whether
	317	* an alarm interrupt occurs or not.
	318	*/
	319	static int mxc_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	320	{
	321	struct platform_device *pdev = to_platform_device(dev);
	322	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	323	void __iomem *ioaddr = pdata->ioaddr;
	324
	325	rtc_time_to_tm(get_alarm_or_time(dev, MXC_RTC_ALARM), &alrm->time);
	326	alrm->pending = ((readw(ioaddr + RTC_RTCISR) & RTC_ALM_BIT)) ? 1 : 0;
	327
	328	return 0;
	329	}
	330
	331	/*
	332	* This function sets the RTC alarm based on passed in alrm.
	333	*/
	334	static int mxc_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	335	{
	336	struct platform_device *pdev = to_platform_device(dev);
	337	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
d00ed3cf	338
482494a8	339	rtc_update_alarm(dev, &alrm->time);
d00ed3cf DM	340
	341	memcpy(&pdata->g_rtc_alarm, &alrm->time, sizeof(struct rtc_time));
	342	mxc_rtc_irq_enable(dev, RTC_ALM_BIT, alrm->enabled);
	343
	344	return 0;
	345	}
	346
	347	/* RTC layer */
	348	static struct rtc_class_ops mxc_rtc_ops = {
	349	.release = mxc_rtc_release,
	350	.read_time = mxc_rtc_read_time,
	351	.set_mmss = mxc_rtc_set_mmss,
	352	.read_alarm = mxc_rtc_read_alarm,
	353	.set_alarm = mxc_rtc_set_alarm,
	354	.alarm_irq_enable = mxc_rtc_alarm_irq_enable,
d00ed3cf DM	355	};
d00ed3cf DM	356
5a167f45	357	static int mxc_rtc_probe(struct platform_device *pdev)
d00ed3cf	358	{
d00ed3cf DM	359	struct resource *res;
	360	struct rtc_device *rtc;
	361	struct rtc_plat_data *pdata = NULL;
	362	u32 reg;
c783a29e VZ	363	unsigned long rate;
c783a29e VZ	364	int ret;
d00ed3cf	365
c783a29e	366	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
d00ed3cf DM	367	if (!pdata)
	368	return -ENOMEM;
	369
bb1d34a2 SG	370	pdata->devtype = pdev->id_entry->driver_data;
bb1d34a2 SG	371
7c1d69ee JL	372	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	373	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
	374	if (IS_ERR(pdata->ioaddr))
	375	return PTR_ERR(pdata->ioaddr);
d00ed3cf	376
0f3cde53	377	pdata->clk = devm_clk_get(&pdev->dev, NULL);
5cf8f57d VZ	378	if (IS_ERR(pdata->clk)) {
5cf8f57d VZ	379	dev_err(&pdev->dev, "unable to get clock!\n");
fbd5e754	380	return PTR_ERR(pdata->clk);
49908e73	381	}
d00ed3cf	382
1b3d2243 FE	383	ret = clk_prepare_enable(pdata->clk);
	384	if (ret)
	385	return ret;
	386
5cf8f57d	387	rate = clk_get_rate(pdata->clk);
d00ed3cf DM	388
	389	if (rate == 32768)
	390	reg = RTC_INPUT_CLK_32768HZ;
	391	else if (rate == 32000)
	392	reg = RTC_INPUT_CLK_32000HZ;
	393	else if (rate == 38400)
	394	reg = RTC_INPUT_CLK_38400HZ;
	395	else {
c783a29e	396	dev_err(&pdev->dev, "rtc clock is not valid (%lu)\n", rate);
d00ed3cf	397	ret = -EINVAL;
5cf8f57d	398	goto exit_put_clk;
d00ed3cf DM	399	}
	400
	401	reg \|= RTC_ENABLE_BIT;
	402	writew(reg, (pdata->ioaddr + RTC_RTCCTL));
	403	if (((readw(pdata->ioaddr + RTC_RTCCTL)) & RTC_ENABLE_BIT) == 0) {
	404	dev_err(&pdev->dev, "hardware module can't be enabled!\n");
	405	ret = -EIO;
5cf8f57d	406	goto exit_put_clk;
d00ed3cf DM	407	}
d00ed3cf DM	408
d00ed3cf DM	409	platform_set_drvdata(pdev, pdata);
	410
	411	/* Configure and enable the RTC */
	412	pdata->irq = platform_get_irq(pdev, 0);
	413
	414	if (pdata->irq >= 0 &&
c783a29e VZ	415	devm_request_irq(&pdev->dev, pdata->irq, mxc_rtc_interrupt,
c783a29e VZ	416	IRQF_SHARED, pdev->name, pdev) < 0) {
d00ed3cf DM	417	dev_warn(&pdev->dev, "interrupt not available.\n");
	418	pdata->irq = -1;
	419	}
	420
4a8282d0	421	if (pdata->irq >= 0)
c92182ee YK	422	device_init_wakeup(&pdev->dev, 1);
c92182ee YK	423
033ca3ad	424	rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &mxc_rtc_ops,
5f54c8a0 WS	425	THIS_MODULE);
	426	if (IS_ERR(rtc)) {
	427	ret = PTR_ERR(rtc);
d2f3a398	428	goto exit_put_clk;
5f54c8a0 WS	429	}
	430
	431	pdata->rtc = rtc;
	432
d00ed3cf DM	433	return 0;
	434
	435	exit_put_clk:
0f3cde53	436	clk_disable_unprepare(pdata->clk);
d00ed3cf	437
d00ed3cf DM	438	return ret;
	439	}
	440
5a167f45	441	static int mxc_rtc_remove(struct platform_device *pdev)
d00ed3cf DM	442	{
	443	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	444
0f3cde53	445	clk_disable_unprepare(pdata->clk);
d00ed3cf DM	446
	447	return 0;
	448	}
	449
75634cc4	450	#ifdef CONFIG_PM_SLEEP
c92182ee YK	451	static int mxc_rtc_suspend(struct device *dev)
	452	{
	453	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	454
	455	if (device_may_wakeup(dev))
	456	enable_irq_wake(pdata->irq);
	457
	458	return 0;
	459	}
	460
	461	static int mxc_rtc_resume(struct device *dev)
	462	{
	463	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	464
	465	if (device_may_wakeup(dev))
	466	disable_irq_wake(pdata->irq);
	467
	468	return 0;
	469	}
c92182ee YK	470	#endif
c92182ee YK	471
75634cc4 JH	472	static SIMPLE_DEV_PM_OPS(mxc_rtc_pm_ops, mxc_rtc_suspend, mxc_rtc_resume);
75634cc4 JH	473
d00ed3cf DM	474	static struct platform_driver mxc_rtc_driver = {
	475	.driver = {
	476	.name = "mxc_rtc",
c92182ee	477	.pm = &mxc_rtc_pm_ops,
d00ed3cf	478	},
bb1d34a2	479	.id_table = imx_rtc_devtype,
be8b6d51	480	.probe = mxc_rtc_probe,
5a167f45	481	.remove = mxc_rtc_remove,
d00ed3cf DM	482	};
d00ed3cf DM	483
be8b6d51	484	module_platform_driver(mxc_rtc_driver)
d00ed3cf DM	485
	486	MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
	487	MODULE_DESCRIPTION("RTC driver for Freescale MXC");
	488	MODULE_LICENSE("GPL");
	489