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

/*
 * Real Time Clock interface for XScale PXA27x and PXA3xx
 *
 * Copyright (C) 2008 Robert Jarzmik
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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/init.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <mach/hardware.h>

#define TIMER_FREQ		CLOCK_TICK_RATE
#define RTC_DEF_DIVIDER		(32768 - 1)
#define RTC_DEF_TRIM		0
#define MAXFREQ_PERIODIC	1000

/*
 * PXA Registers and bits definitions
 */
#define RTSR_PICE	(1 << 15)	/* Periodic interrupt count enable */
#define RTSR_PIALE	(1 << 14)	/* Periodic interrupt Alarm enable */
#define RTSR_PIAL	(1 << 13)	/* Periodic interrupt detected */
#define RTSR_SWALE2	(1 << 11)	/* RTC stopwatch alarm2 enable */
#define RTSR_SWAL2	(1 << 10)	/* RTC stopwatch alarm2 detected */
#define RTSR_SWALE1	(1 << 9)	/* RTC stopwatch alarm1 enable */
#define RTSR_SWAL1	(1 << 8)	/* RTC stopwatch alarm1 detected */
#define RTSR_RDALE2	(1 << 7)	/* RTC alarm2 enable */
#define RTSR_RDAL2	(1 << 6)	/* RTC alarm2 detected */
#define RTSR_RDALE1	(1 << 5)	/* RTC alarm1 enable */
#define RTSR_RDAL1	(1 << 4)	/* RTC alarm1 detected */
#define RTSR_HZE	(1 << 3)	/* HZ interrupt enable */
#define RTSR_ALE	(1 << 2)	/* RTC alarm interrupt enable */
#define RTSR_HZ		(1 << 1)	/* HZ rising-edge detected */
#define RTSR_AL		(1 << 0)	/* RTC alarm detected */
#define RTSR_TRIG_MASK	(RTSR_AL | RTSR_HZ | RTSR_RDAL1 | RTSR_RDAL2\
			 | RTSR_SWAL1 | RTSR_SWAL2)
#define RYxR_YEAR_S	9
#define RYxR_YEAR_MASK	(0xfff << RYxR_YEAR_S)
#define RYxR_MONTH_S	5
#define RYxR_MONTH_MASK	(0xf << RYxR_MONTH_S)
#define RYxR_DAY_MASK	0x1f
#define RDxR_HOUR_S	12
#define RDxR_HOUR_MASK	(0x1f << RDxR_HOUR_S)
#define RDxR_MIN_S	6
#define RDxR_MIN_MASK	(0x3f << RDxR_MIN_S)
#define RDxR_SEC_MASK	0x3f

#define RTSR		0x08
#define RTTR		0x0c
#define RDCR		0x10
#define RYCR		0x14
#define RDAR1		0x18
#define RYAR1		0x1c
#define RTCPICR		0x34
#define PIAR		0x38

#define rtc_readl(pxa_rtc, reg)	\
	__raw_readl((pxa_rtc)->base + (reg))
#define rtc_writel(pxa_rtc, reg, value)	\
	__raw_writel((value), (pxa_rtc)->base + (reg))

struct pxa_rtc {
	struct resource	*ress;
	void __iomem		*base;
	int			irq_1Hz;
	int			irq_Alrm;
	struct rtc_device	*rtc;
	spinlock_t		lock;		/* Protects this structure */
};

static u32 ryxr_calc(struct rtc_time *tm)
{
	return ((tm->tm_year + 1900) << RYxR_YEAR_S)
		| ((tm->tm_mon + 1) << RYxR_MONTH_S)
		| tm->tm_mday;
}

static u32 rdxr_calc(struct rtc_time *tm)
{
	return (tm->tm_hour << RDxR_HOUR_S) | (tm->tm_min << RDxR_MIN_S)
		| tm->tm_sec;
}

static void tm_calc(u32 rycr, u32 rdcr, struct rtc_time *tm)
{
	tm->tm_year = ((rycr & RYxR_YEAR_MASK) >> RYxR_YEAR_S) - 1900;
	tm->tm_mon = (((rycr & RYxR_MONTH_MASK) >> RYxR_MONTH_S)) - 1;
	tm->tm_mday = (rycr & RYxR_DAY_MASK);
	tm->tm_hour = (rdcr & RDxR_HOUR_MASK) >> RDxR_HOUR_S;
	tm->tm_min = (rdcr & RDxR_MIN_MASK) >> RDxR_MIN_S;
	tm->tm_sec = rdcr & RDxR_SEC_MASK;
}

static void rtsr_clear_bits(struct pxa_rtc *pxa_rtc, u32 mask)
{
	u32 rtsr;

	rtsr = rtc_readl(pxa_rtc, RTSR);
	rtsr &= ~RTSR_TRIG_MASK;
	rtsr &= ~mask;
	rtc_writel(pxa_rtc, RTSR, rtsr);
}

static void rtsr_set_bits(struct pxa_rtc *pxa_rtc, u32 mask)
{
	u32 rtsr;

	rtsr = rtc_readl(pxa_rtc, RTSR);
	rtsr &= ~RTSR_TRIG_MASK;
	rtsr |= mask;
	rtc_writel(pxa_rtc, RTSR, rtsr);
}

static irqreturn_t pxa_rtc_irq(int irq, void *dev_id)
{
	struct platform_device *pdev = to_platform_device(dev_id);
	struct pxa_rtc *pxa_rtc = platform_get_drvdata(pdev);
	u32 rtsr;
	unsigned long events = 0;

	spin_lock(&pxa_rtc->lock);

	/* clear interrupt sources */
	rtsr = rtc_readl(pxa_rtc, RTSR);
	rtc_writel(pxa_rtc, RTSR, rtsr);

	/* temporary disable rtc interrupts */
	rtsr_clear_bits(pxa_rtc, RTSR_RDALE1 | RTSR_PIALE | RTSR_HZE);

	/* clear alarm interrupt if it has occurred */
	if (rtsr & RTSR_RDAL1)
		rtsr &= ~RTSR_RDALE1;

	/* update irq data & counter */
	if (rtsr & RTSR_RDAL1)
		events |= RTC_AF | RTC_IRQF;
	if (rtsr & RTSR_HZ)
		events |= RTC_UF | RTC_IRQF;
	if (rtsr & RTSR_PIAL)
		events |= RTC_PF | RTC_IRQF;

	rtc_update_irq(pxa_rtc->rtc, 1, events);

	/* enable back rtc interrupts */
	rtc_writel(pxa_rtc, RTSR, rtsr & ~RTSR_TRIG_MASK);

	spin_unlock(&pxa_rtc->lock);
	return IRQ_HANDLED;
}

static int pxa_rtc_open(struct device *dev)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	int ret;

	ret = request_irq(pxa_rtc->irq_1Hz, pxa_rtc_irq, IRQF_DISABLED,
			  "rtc 1Hz", dev);
	if (ret < 0) {
		dev_err(dev, "can't get irq %i, err %d\n", pxa_rtc->irq_1Hz,
			ret);
		goto err_irq_1Hz;
	}
	ret = request_irq(pxa_rtc->irq_Alrm, pxa_rtc_irq, IRQF_DISABLED,
			  "rtc Alrm", dev);
	if (ret < 0) {
		dev_err(dev, "can't get irq %i, err %d\n", pxa_rtc->irq_Alrm,
			ret);
		goto err_irq_Alrm;
	}

	return 0;

err_irq_Alrm:
	free_irq(pxa_rtc->irq_1Hz, dev);
err_irq_1Hz:
	return ret;
}

static void pxa_rtc_release(struct device *dev)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);

	spin_lock_irq(&pxa_rtc->lock);
	rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE);
	spin_unlock_irq(&pxa_rtc->lock);

	free_irq(pxa_rtc->irq_Alrm, dev);
	free_irq(pxa_rtc->irq_1Hz, dev);
}

static int pxa_periodic_irq_set_freq(struct device *dev, int freq)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	int period_ms;

	if (freq < 1 || freq > MAXFREQ_PERIODIC)
		return -EINVAL;

	period_ms = 1000 / freq;
	rtc_writel(pxa_rtc, PIAR, period_ms);

	return 0;
}

static int pxa_periodic_irq_set_state(struct device *dev, int enabled)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);

	if (enabled)
		rtsr_set_bits(pxa_rtc, RTSR_PIALE | RTSR_PICE);
	else
		rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_PICE);

	return 0;
}

static int pxa_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);

	spin_lock_irq(&pxa_rtc->lock);

	if (enabled)
		rtsr_set_bits(pxa_rtc, RTSR_RDALE1);
	else
		rtsr_clear_bits(pxa_rtc, RTSR_RDALE1);

	spin_unlock_irq(&pxa_rtc->lock);
	return 0;
}

static int pxa_update_irq_enable(struct device *dev, unsigned int enabled)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);

	spin_lock_irq(&pxa_rtc->lock);

	if (enabled)
		rtsr_set_bits(pxa_rtc, RTSR_HZE);
	else
		rtsr_clear_bits(pxa_rtc, RTSR_HZE);

	spin_unlock_irq(&pxa_rtc->lock);
	return 0;
}

static int pxa_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	u32 rycr, rdcr;

	rycr = rtc_readl(pxa_rtc, RYCR);
	rdcr = rtc_readl(pxa_rtc, RDCR);

	tm_calc(rycr, rdcr, tm);
	return 0;
}

static int pxa_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);

	rtc_writel(pxa_rtc, RYCR, ryxr_calc(tm));
	rtc_writel(pxa_rtc, RDCR, rdxr_calc(tm));

	return 0;
}

static int pxa_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	u32 rtsr, ryar, rdar;

	ryar = rtc_readl(pxa_rtc, RYAR1);
	rdar = rtc_readl(pxa_rtc, RDAR1);
	tm_calc(ryar, rdar, &alrm->time);

	rtsr = rtc_readl(pxa_rtc, RTSR);
	alrm->enabled = (rtsr & RTSR_RDALE1) ? 1 : 0;
	alrm->pending = (rtsr & RTSR_RDAL1) ? 1 : 0;
	return 0;
}

static int pxa_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	u32 rtsr;

	spin_lock_irq(&pxa_rtc->lock);

	rtc_writel(pxa_rtc, RYAR1, ryxr_calc(&alrm->time));
	rtc_writel(pxa_rtc, RDAR1, rdxr_calc(&alrm->time));

	rtsr = rtc_readl(pxa_rtc, RTSR);
	if (alrm->enabled)
		rtsr |= RTSR_RDALE1;
	else
		rtsr &= ~RTSR_RDALE1;
	rtc_writel(pxa_rtc, RTSR, rtsr);

	spin_unlock_irq(&pxa_rtc->lock);

	return 0;
}

static int pxa_rtc_proc(struct device *dev, struct seq_file *seq)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);

	seq_printf(seq, "trim/divider\t: 0x%08x\n", rtc_readl(pxa_rtc, RTTR));
	seq_printf(seq, "update_IRQ\t: %s\n",
		   (rtc_readl(pxa_rtc, RTSR) & RTSR_HZE) ? "yes" : "no");
	seq_printf(seq, "periodic_IRQ\t: %s\n",
		   (rtc_readl(pxa_rtc, RTSR) & RTSR_PIALE) ? "yes" : "no");
	seq_printf(seq, "periodic_freq\t: %u\n", rtc_readl(pxa_rtc, PIAR));

	return 0;
}

static const struct rtc_class_ops pxa_rtc_ops = {
	.open = pxa_rtc_open,
	.release = pxa_rtc_release,
	.read_time = pxa_rtc_read_time,
	.set_time = pxa_rtc_set_time,
	.read_alarm = pxa_rtc_read_alarm,
	.set_alarm = pxa_rtc_set_alarm,
	.alarm_irq_enable = pxa_alarm_irq_enable,
	.update_irq_enable = pxa_update_irq_enable,
	.proc = pxa_rtc_proc,
	.irq_set_state = pxa_periodic_irq_set_state,
	.irq_set_freq = pxa_periodic_irq_set_freq,
};

static int __init pxa_rtc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct pxa_rtc *pxa_rtc;
	int ret;
	u32 rttr;

	pxa_rtc = kzalloc(sizeof(struct pxa_rtc), GFP_KERNEL);
	if (!pxa_rtc)
		return -ENOMEM;

	spin_lock_init(&pxa_rtc->lock);
	platform_set_drvdata(pdev, pxa_rtc);

	ret = -ENXIO;
	pxa_rtc->ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!pxa_rtc->ress) {
		dev_err(dev, "No I/O memory resource defined\n");
		goto err_ress;
	}

	pxa_rtc->irq_1Hz = platform_get_irq(pdev, 0);
	if (pxa_rtc->irq_1Hz < 0) {
		dev_err(dev, "No 1Hz IRQ resource defined\n");
		goto err_ress;
	}
	pxa_rtc->irq_Alrm = platform_get_irq(pdev, 1);
	if (pxa_rtc->irq_Alrm < 0) {
		dev_err(dev, "No alarm IRQ resource defined\n");
		goto err_ress;
	}

	ret = -ENOMEM;
	pxa_rtc->base = ioremap(pxa_rtc->ress->start,
				resource_size(pxa_rtc->ress));
	if (!pxa_rtc->base) {
		dev_err(&pdev->dev, "Unable to map pxa RTC I/O memory\n");
		goto err_map;
	}

	/*
	 * If the clock divider is uninitialized then reset it to the
	 * default value to get the 1Hz clock.
	 */
	if (rtc_readl(pxa_rtc, RTTR) == 0) {
		rttr = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
		rtc_writel(pxa_rtc, RTTR, rttr);
		dev_warn(dev, "warning: initializing default clock"
			 " divider/trim value\n");
	}

	rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE);

	pxa_rtc->rtc = rtc_device_register("pxa-rtc", &pdev->dev, &pxa_rtc_ops,
					   THIS_MODULE);
	ret = PTR_ERR(pxa_rtc->rtc);
	if (IS_ERR(pxa_rtc->rtc)) {
		dev_err(dev, "Failed to register RTC device -> %d\n", ret);
		goto err_rtc_reg;
	}

	device_init_wakeup(dev, 1);

	return 0;

err_rtc_reg:
	 iounmap(pxa_rtc->base);
err_ress:
err_map:
	kfree(pxa_rtc);
	return ret;
}

static int __exit pxa_rtc_remove(struct platform_device *pdev)
{
	struct pxa_rtc *pxa_rtc = platform_get_drvdata(pdev);

	rtc_device_unregister(pxa_rtc->rtc);

	spin_lock_irq(&pxa_rtc->lock);
	iounmap(pxa_rtc->base);
	spin_unlock_irq(&pxa_rtc->lock);

	kfree(pxa_rtc);

	return 0;
}

#ifdef CONFIG_PM
static int pxa_rtc_suspend(struct device *dev)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(pxa_rtc->irq_Alrm);
	return 0;
}

static int pxa_rtc_resume(struct device *dev)
{
	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(pxa_rtc->irq_Alrm);
	return 0;
}

static const struct dev_pm_ops pxa_rtc_pm_ops = {
	.suspend	= pxa_rtc_suspend,
	.resume		= pxa_rtc_resume,
};
#endif

static struct platform_driver pxa_rtc_driver = {
	.remove		= __exit_p(pxa_rtc_remove),
	.driver		= {
		.name	= "pxa-rtc",
#ifdef CONFIG_PM
		.pm	= &pxa_rtc_pm_ops,
#endif
	},
};

static int __init pxa_rtc_init(void)
{
	if (cpu_is_pxa27x() || cpu_is_pxa3xx())
		return platform_driver_probe(&pxa_rtc_driver, pxa_rtc_probe);

	return -ENODEV;
}

static void __exit pxa_rtc_exit(void)
{
	platform_driver_unregister(&pxa_rtc_driver);
}

module_init(pxa_rtc_init);
module_exit(pxa_rtc_exit);

MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
MODULE_DESCRIPTION("PXA27x/PXA3xx Realtime Clock Driver (RTC)");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa-rtc");
Commit	Line	Data
dc944368 RJ	1	/*
	2	* Real Time Clock interface for XScale PXA27x and PXA3xx
	3	*
	4	* Copyright (C) 2008 Robert Jarzmik
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
0417ce2a	22	#include <linux/init.h>
dc944368 RJ	23	#include <linux/platform_device.h>
	24	#include <linux/module.h>
	25	#include <linux/rtc.h>
	26	#include <linux/seq_file.h>
	27	#include <linux/interrupt.h>
0417ce2a	28	#include <linux/io.h>
5a0e3ad6	29	#include <linux/slab.h>
dc944368	30
4216d0bd AO	31	#include <mach/hardware.h>
4216d0bd AO	32
dc944368 RJ	33	#define TIMER_FREQ CLOCK_TICK_RATE
	34	#define RTC_DEF_DIVIDER (32768 - 1)
	35	#define RTC_DEF_TRIM 0
	36	#define MAXFREQ_PERIODIC 1000
	37
	38	/*
	39	* PXA Registers and bits definitions
	40	*/
	41	#define RTSR_PICE (1 << 15) /* Periodic interrupt count enable */
	42	#define RTSR_PIALE (1 << 14) /* Periodic interrupt Alarm enable */
	43	#define RTSR_PIAL (1 << 13) /* Periodic interrupt detected */
	44	#define RTSR_SWALE2 (1 << 11) /* RTC stopwatch alarm2 enable */
	45	#define RTSR_SWAL2 (1 << 10) /* RTC stopwatch alarm2 detected */
	46	#define RTSR_SWALE1 (1 << 9) /* RTC stopwatch alarm1 enable */
	47	#define RTSR_SWAL1 (1 << 8) /* RTC stopwatch alarm1 detected */
	48	#define RTSR_RDALE2 (1 << 7) /* RTC alarm2 enable */
	49	#define RTSR_RDAL2 (1 << 6) /* RTC alarm2 detected */
	50	#define RTSR_RDALE1 (1 << 5) /* RTC alarm1 enable */
	51	#define RTSR_RDAL1 (1 << 4) /* RTC alarm1 detected */
	52	#define RTSR_HZE (1 << 3) /* HZ interrupt enable */
	53	#define RTSR_ALE (1 << 2) /* RTC alarm interrupt enable */
	54	#define RTSR_HZ (1 << 1) /* HZ rising-edge detected */
	55	#define RTSR_AL (1 << 0) /* RTC alarm detected */
	56	#define RTSR_TRIG_MASK (RTSR_AL \| RTSR_HZ \| RTSR_RDAL1 \| RTSR_RDAL2\
	57	\| RTSR_SWAL1 \| RTSR_SWAL2)
	58	#define RYxR_YEAR_S 9
	59	#define RYxR_YEAR_MASK (0xfff << RYxR_YEAR_S)
	60	#define RYxR_MONTH_S 5
	61	#define RYxR_MONTH_MASK (0xf << RYxR_MONTH_S)
	62	#define RYxR_DAY_MASK 0x1f
	63	#define RDxR_HOUR_S 12
	64	#define RDxR_HOUR_MASK (0x1f << RDxR_HOUR_S)
	65	#define RDxR_MIN_S 6
	66	#define RDxR_MIN_MASK (0x3f << RDxR_MIN_S)
	67	#define RDxR_SEC_MASK 0x3f
	68
	69	#define RTSR 0x08
	70	#define RTTR 0x0c
	71	#define RDCR 0x10
	72	#define RYCR 0x14
	73	#define RDAR1 0x18
	74	#define RYAR1 0x1c
	75	#define RTCPICR 0x34
	76	#define PIAR 0x38
	77
	78	#define rtc_readl(pxa_rtc, reg) \
	79	__raw_readl((pxa_rtc)->base + (reg))
	80	#define rtc_writel(pxa_rtc, reg, value) \
	81	__raw_writel((value), (pxa_rtc)->base + (reg))
	82
	83	struct pxa_rtc {
	84	struct resource *ress;
	85	void __iomem *base;
	86	int irq_1Hz;
	87	int irq_Alrm;
	88	struct rtc_device *rtc;
	89	spinlock_t lock; /* Protects this structure */
dc944368 RJ	90	};
	91
	92	static u32 ryxr_calc(struct rtc_time *tm)
	93	{
	94	return ((tm->tm_year + 1900) << RYxR_YEAR_S)
	95	\| ((tm->tm_mon + 1) << RYxR_MONTH_S)
	96	\| tm->tm_mday;
	97	}
	98
	99	static u32 rdxr_calc(struct rtc_time *tm)
	100	{
	101	return (tm->tm_hour << RDxR_HOUR_S) \| (tm->tm_min << RDxR_MIN_S)
	102	\| tm->tm_sec;
	103	}
	104
	105	static void tm_calc(u32 rycr, u32 rdcr, struct rtc_time *tm)
	106	{
	107	tm->tm_year = ((rycr & RYxR_YEAR_MASK) >> RYxR_YEAR_S) - 1900;
	108	tm->tm_mon = (((rycr & RYxR_MONTH_MASK) >> RYxR_MONTH_S)) - 1;
	109	tm->tm_mday = (rycr & RYxR_DAY_MASK);
	110	tm->tm_hour = (rdcr & RDxR_HOUR_MASK) >> RDxR_HOUR_S;
	111	tm->tm_min = (rdcr & RDxR_MIN_MASK) >> RDxR_MIN_S;
	112	tm->tm_sec = rdcr & RDxR_SEC_MASK;
	113	}
	114
	115	static void rtsr_clear_bits(struct pxa_rtc *pxa_rtc, u32 mask)
	116	{
	117	u32 rtsr;
	118
	119	rtsr = rtc_readl(pxa_rtc, RTSR);
	120	rtsr &= ~RTSR_TRIG_MASK;
	121	rtsr &= ~mask;
	122	rtc_writel(pxa_rtc, RTSR, rtsr);
	123	}
	124
	125	static void rtsr_set_bits(struct pxa_rtc *pxa_rtc, u32 mask)
	126	{
	127	u32 rtsr;
	128
	129	rtsr = rtc_readl(pxa_rtc, RTSR);
	130	rtsr &= ~RTSR_TRIG_MASK;
	131	rtsr \|= mask;
	132	rtc_writel(pxa_rtc, RTSR, rtsr);
	133	}
	134
	135	static irqreturn_t pxa_rtc_irq(int irq, void *dev_id)
	136	{
	137	struct platform_device *pdev = to_platform_device(dev_id);
	138	struct pxa_rtc *pxa_rtc = platform_get_drvdata(pdev);
	139	u32 rtsr;
	140	unsigned long events = 0;
	141
	142	spin_lock(&pxa_rtc->lock);
	143
	144	/* clear interrupt sources */
	145	rtsr = rtc_readl(pxa_rtc, RTSR);
	146	rtc_writel(pxa_rtc, RTSR, rtsr);
	147
	148	/* temporary disable rtc interrupts */
	149	rtsr_clear_bits(pxa_rtc, RTSR_RDALE1 \| RTSR_PIALE \| RTSR_HZE);
	150
	151	/* clear alarm interrupt if it has occurred */
	152	if (rtsr & RTSR_RDAL1)
	153	rtsr &= ~RTSR_RDALE1;
154
155	/* update irq data & counter */
156	if (rtsr & RTSR_RDAL1)
157	events \|= RTC_AF \| RTC_IRQF;
158	if (rtsr & RTSR_HZ)
159	events \|= RTC_UF \| RTC_IRQF;
160	if (rtsr & RTSR_PIAL)
161	events \|= RTC_PF \| RTC_IRQF;
162
163	rtc_update_irq(pxa_rtc->rtc, 1, events);
164
165	/* enable back rtc interrupts */
166	rtc_writel(pxa_rtc, RTSR, rtsr & ~RTSR_TRIG_MASK);
167
168	spin_unlock(&pxa_rtc->lock);
169	return IRQ_HANDLED;
170	}
171
172	static int pxa_rtc_open(struct device *dev)
173	{
174	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
175	int ret;
176
177	ret = request_irq(pxa_rtc->irq_1Hz, pxa_rtc_irq, IRQF_DISABLED,
178	"rtc 1Hz", dev);
179	if (ret < 0) {
180	dev_err(dev, "can't get irq %i, err %d\n", pxa_rtc->irq_1Hz,
181	ret);
182	goto err_irq_1Hz;
183	}
184	ret = request_irq(pxa_rtc->irq_Alrm, pxa_rtc_irq, IRQF_DISABLED,
185	"rtc Alrm", dev);
186	if (ret < 0) {
187	dev_err(dev, "can't get irq %i, err %d\n", pxa_rtc->irq_Alrm,
188	ret);
189	goto err_irq_Alrm;
190	}
191
192	return 0;
193
194	err_irq_Alrm:
195	free_irq(pxa_rtc->irq_1Hz, dev);
196	err_irq_1Hz:
197	return ret;
198	}
199
200	static void pxa_rtc_release(struct device *dev)
201	{
202	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
203
204	spin_lock_irq(&pxa_rtc->lock);
205	rtsr_clear_bits(pxa_rtc, RTSR_PIALE \| RTSR_RDALE1 \| RTSR_HZE);
206	spin_unlock_irq(&pxa_rtc->lock);
207
208	free_irq(pxa_rtc->irq_Alrm, dev);
209	free_irq(pxa_rtc->irq_1Hz, dev);
210	}
211
212	static int pxa_periodic_irq_set_freq(struct device *dev, int freq)
213	{
214	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
215	int period_ms;
216
217	if (freq < 1 \|\| freq > MAXFREQ_PERIODIC)
218	return -EINVAL;
219
220	period_ms = 1000 / freq;
221	rtc_writel(pxa_rtc, PIAR, period_ms);
222
223	return 0;
224	}
225
226	static int pxa_periodic_irq_set_state(struct device *dev, int enabled)
227	{
228	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
229
230	if (enabled)
231	rtsr_set_bits(pxa_rtc, RTSR_PIALE \| RTSR_PICE);
232	else
233	rtsr_clear_bits(pxa_rtc, RTSR_PIALE \| RTSR_PICE);
234
235	return 0;
236	}
237
93b1384f	238	static int pxa_alarm_irq_enable(struct device *dev, unsigned int enabled)
dc944368 RJ	239	{
dc944368 RJ	240	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
dc944368 RJ	241
dc944368 RJ	242	spin_lock_irq(&pxa_rtc->lock);
93b1384f WZ	243
93b1384f WZ	244	if (enabled)
dc944368	245	rtsr_set_bits(pxa_rtc, RTSR_RDALE1);
93b1384f WZ	246	else
	247	rtsr_clear_bits(pxa_rtc, RTSR_RDALE1);
	248
	249	spin_unlock_irq(&pxa_rtc->lock);
	250	return 0;
	251	}
	252
	253	static int pxa_update_irq_enable(struct device *dev, unsigned int enabled)
	254	{
	255	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	256
	257	spin_lock_irq(&pxa_rtc->lock);
	258
	259	if (enabled)
dc944368	260	rtsr_set_bits(pxa_rtc, RTSR_HZE);
93b1384f WZ	261	else
93b1384f WZ	262	rtsr_clear_bits(pxa_rtc, RTSR_HZE);
dc944368 RJ	263
dc944368 RJ	264	spin_unlock_irq(&pxa_rtc->lock);
93b1384f	265	return 0;
dc944368 RJ	266	}
	267
	268	static int pxa_rtc_read_time(struct device dev, struct rtc_time tm)
	269	{
	270	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	271	u32 rycr, rdcr;
	272
	273	rycr = rtc_readl(pxa_rtc, RYCR);
	274	rdcr = rtc_readl(pxa_rtc, RDCR);
	275
	276	tm_calc(rycr, rdcr, tm);
	277	return 0;
	278	}
	279
	280	static int pxa_rtc_set_time(struct device dev, struct rtc_time tm)
	281	{
	282	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	283
	284	rtc_writel(pxa_rtc, RYCR, ryxr_calc(tm));
	285	rtc_writel(pxa_rtc, RDCR, rdxr_calc(tm));
	286
	287	return 0;
	288	}
	289
	290	static int pxa_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	291	{
	292	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	293	u32 rtsr, ryar, rdar;
	294
	295	ryar = rtc_readl(pxa_rtc, RYAR1);
	296	rdar = rtc_readl(pxa_rtc, RDAR1);
	297	tm_calc(ryar, rdar, &alrm->time);
	298
	299	rtsr = rtc_readl(pxa_rtc, RTSR);
	300	alrm->enabled = (rtsr & RTSR_RDALE1) ? 1 : 0;
	301	alrm->pending = (rtsr & RTSR_RDAL1) ? 1 : 0;
	302	return 0;
	303	}
	304
	305	static int pxa_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	306	{
	307	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
	308	u32 rtsr;
	309
	310	spin_lock_irq(&pxa_rtc->lock);
	311
	312	rtc_writel(pxa_rtc, RYAR1, ryxr_calc(&alrm->time));
	313	rtc_writel(pxa_rtc, RDAR1, rdxr_calc(&alrm->time));
	314
	315	rtsr = rtc_readl(pxa_rtc, RTSR);
	316	if (alrm->enabled)
	317	rtsr \|= RTSR_RDALE1;
	318	else
	319	rtsr &= ~RTSR_RDALE1;
	320	rtc_writel(pxa_rtc, RTSR, rtsr);
	321
	322	spin_unlock_irq(&pxa_rtc->lock);
	323
	324	return 0;
	325	}
	326
	327	static int pxa_rtc_proc(struct device dev, struct seq_file seq)
	328	{
	329	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
330
331	seq_printf(seq, "trim/divider\t: 0x%08x\n", rtc_readl(pxa_rtc, RTTR));
332	seq_printf(seq, "update_IRQ\t: %s\n",
333	(rtc_readl(pxa_rtc, RTSR) & RTSR_HZE) ? "yes" : "no");
334	seq_printf(seq, "periodic_IRQ\t: %s\n",
335	(rtc_readl(pxa_rtc, RTSR) & RTSR_PIALE) ? "yes" : "no");
336	seq_printf(seq, "periodic_freq\t: %u\n", rtc_readl(pxa_rtc, PIAR));
337
338	return 0;
339	}
340
341	static const struct rtc_class_ops pxa_rtc_ops = {
342	.open = pxa_rtc_open,
343	.release = pxa_rtc_release,
dc944368 RJ	344	.read_time = pxa_rtc_read_time,
	345	.set_time = pxa_rtc_set_time,
	346	.read_alarm = pxa_rtc_read_alarm,
	347	.set_alarm = pxa_rtc_set_alarm,
93b1384f WZ	348	.alarm_irq_enable = pxa_alarm_irq_enable,
93b1384f WZ	349	.update_irq_enable = pxa_update_irq_enable,
dc944368 RJ	350	.proc = pxa_rtc_proc,
	351	.irq_set_state = pxa_periodic_irq_set_state,
	352	.irq_set_freq = pxa_periodic_irq_set_freq,
	353	};
	354
0417ce2a	355	static int __init pxa_rtc_probe(struct platform_device *pdev)
dc944368 RJ	356	{
	357	struct device *dev = &pdev->dev;
	358	struct pxa_rtc *pxa_rtc;
	359	int ret;
	360	u32 rttr;
	361
dc944368 RJ	362	pxa_rtc = kzalloc(sizeof(struct pxa_rtc), GFP_KERNEL);
dc944368 RJ	363	if (!pxa_rtc)
0417ce2a AZ	364	return -ENOMEM;
	365
	366	spin_lock_init(&pxa_rtc->lock);
	367	platform_set_drvdata(pdev, pxa_rtc);
dc944368 RJ	368
	369	ret = -ENXIO;
	370	pxa_rtc->ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	371	if (!pxa_rtc->ress) {
	372	dev_err(dev, "No I/O memory resource defined\n");
	373	goto err_ress;
	374	}
	375
	376	pxa_rtc->irq_1Hz = platform_get_irq(pdev, 0);
	377	if (pxa_rtc->irq_1Hz < 0) {
	378	dev_err(dev, "No 1Hz IRQ resource defined\n");
	379	goto err_ress;
	380	}
	381	pxa_rtc->irq_Alrm = platform_get_irq(pdev, 1);
	382	if (pxa_rtc->irq_Alrm < 0) {
	383	dev_err(dev, "No alarm IRQ resource defined\n");
	384	goto err_ress;
	385	}
	386
dc944368 RJ	387	ret = -ENOMEM;
dc944368 RJ	388	pxa_rtc->base = ioremap(pxa_rtc->ress->start,
0417ce2a	389	resource_size(pxa_rtc->ress));
dc944368 RJ	390	if (!pxa_rtc->base) {
	391	dev_err(&pdev->dev, "Unable to map pxa RTC I/O memory\n");
	392	goto err_map;
	393	}
	394
	395	/*
	396	* If the clock divider is uninitialized then reset it to the
	397	* default value to get the 1Hz clock.
	398	*/
	399	if (rtc_readl(pxa_rtc, RTTR) == 0) {
	400	rttr = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
	401	rtc_writel(pxa_rtc, RTTR, rttr);
	402	dev_warn(dev, "warning: initializing default clock"
	403	" divider/trim value\n");
	404	}
	405
	406	rtsr_clear_bits(pxa_rtc, RTSR_PIALE \| RTSR_RDALE1 \| RTSR_HZE);
0417ce2a AZ	407
	408	pxa_rtc->rtc = rtc_device_register("pxa-rtc", &pdev->dev, &pxa_rtc_ops,
	409	THIS_MODULE);
	410	ret = PTR_ERR(pxa_rtc->rtc);
	411	if (IS_ERR(pxa_rtc->rtc)) {
	412	dev_err(dev, "Failed to register RTC device -> %d\n", ret);
	413	goto err_rtc_reg;
	414	}
	415
dc944368 RJ	416	device_init_wakeup(dev, 1);
	417
	418	return 0;
	419
dc944368	420	err_rtc_reg:
0417ce2a	421	iounmap(pxa_rtc->base);
dc944368	422	err_ress:
0417ce2a	423	err_map:
dc944368	424	kfree(pxa_rtc);
dc944368 RJ	425	return ret;
	426	}
	427
0417ce2a	428	static int __exit pxa_rtc_remove(struct platform_device *pdev)
dc944368 RJ	429	{
	430	struct pxa_rtc *pxa_rtc = platform_get_drvdata(pdev);
	431
0417ce2a AZ	432	rtc_device_unregister(pxa_rtc->rtc);
0417ce2a AZ	433
dc944368 RJ	434	spin_lock_irq(&pxa_rtc->lock);
dc944368 RJ	435	iounmap(pxa_rtc->base);
dc944368 RJ	436	spin_unlock_irq(&pxa_rtc->lock);
dc944368 RJ	437
dc944368 RJ	438	kfree(pxa_rtc);
	439
	440	return 0;
	441	}
	442
	443	#ifdef CONFIG_PM
e6e698a4	444	static int pxa_rtc_suspend(struct device *dev)
dc944368	445	{
e6e698a4	446	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
dc944368	447
e6e698a4	448	if (device_may_wakeup(dev))
dc944368 RJ	449	enable_irq_wake(pxa_rtc->irq_Alrm);
	450	return 0;
	451	}
	452
e6e698a4	453	static int pxa_rtc_resume(struct device *dev)
dc944368	454	{
e6e698a4	455	struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
dc944368	456
e6e698a4	457	if (device_may_wakeup(dev))
dc944368 RJ	458	disable_irq_wake(pxa_rtc->irq_Alrm);
	459	return 0;
	460	}
e6e698a4	461
47145210	462	static const struct dev_pm_ops pxa_rtc_pm_ops = {
e6e698a4 RJ	463	.suspend = pxa_rtc_suspend,
	464	.resume = pxa_rtc_resume,
	465	};
dc944368 RJ	466	#endif
	467
	468	static struct platform_driver pxa_rtc_driver = {
dc944368	469	.remove = __exit_p(pxa_rtc_remove),
dc944368	470	.driver = {
e6e698a4 RJ	471	.name = "pxa-rtc",
	472	#ifdef CONFIG_PM
	473	.pm = &pxa_rtc_pm_ops,
	474	#endif
dc944368 RJ	475	},
	476	};
	477
	478	static int __init pxa_rtc_init(void)
	479	{
	480	if (cpu_is_pxa27x() \|\| cpu_is_pxa3xx())
0417ce2a	481	return platform_driver_probe(&pxa_rtc_driver, pxa_rtc_probe);
dc944368 RJ	482
	483	return -ENODEV;
	484	}
	485
	486	static void __exit pxa_rtc_exit(void)
	487	{
	488	platform_driver_unregister(&pxa_rtc_driver);
	489	}
	490
	491	module_init(pxa_rtc_init);
	492	module_exit(pxa_rtc_exit);
	493
57f63bc8	494	MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
dc944368 RJ	495	MODULE_DESCRIPTION("PXA27x/PXA3xx Realtime Clock Driver (RTC)");
	496	MODULE_LICENSE("GPL");
	497	MODULE_ALIAS("platform:pxa-rtc");