[deliverable/linux.git] / drivers / rtc / rtc-sh.c

/*
 * SuperH On-Chip RTC Support
 *
 * Copyright (C) 2006  Paul Mundt
 *
 * Based on the old arch/sh/kernel/cpu/rtc.c by:
 *
 *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
 *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
 *
 * 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.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>

#ifdef CONFIG_CPU_SH3
#define rtc_reg_size		sizeof(u16)
#define RTC_BIT_INVERTED	0	/* No bug on SH7708, SH7709A */
#elif defined(CONFIG_CPU_SH4)
#define rtc_reg_size		sizeof(u32)
#define RTC_BIT_INVERTED	0x40	/* bug on SH7750, SH7750S */
#endif

#define RTC_REG(r)	((r) * rtc_reg_size)

#define R64CNT		RTC_REG(0)
#define RSECCNT		RTC_REG(1)
#define RMINCNT		RTC_REG(2)
#define RHRCNT		RTC_REG(3)
#define RWKCNT		RTC_REG(4)
#define RDAYCNT		RTC_REG(5)
#define RMONCNT		RTC_REG(6)
#define RYRCNT		RTC_REG(7)
#define RSECAR		RTC_REG(8)
#define RMINAR		RTC_REG(9)
#define RHRAR		RTC_REG(10)
#define RWKAR		RTC_REG(11)
#define RDAYAR		RTC_REG(12)
#define RMONAR		RTC_REG(13)
#define RCR1		RTC_REG(14)
#define RCR2		RTC_REG(15)

/* RCR1 Bits */
#define RCR1_CF		0x80	/* Carry Flag             */
#define RCR1_CIE	0x10	/* Carry Interrupt Enable */
#define RCR1_AIE	0x08	/* Alarm Interrupt Enable */
#define RCR1_AF		0x01	/* Alarm Flag             */

/* RCR2 Bits */
#define RCR2_PEF	0x80	/* PEriodic interrupt Flag */
#define RCR2_PESMASK	0x70	/* Periodic interrupt Set  */
#define RCR2_RTCEN	0x08	/* ENable RTC              */
#define RCR2_ADJ	0x04	/* ADJustment (30-second)  */
#define RCR2_RESET	0x02	/* Reset bit               */
#define RCR2_START	0x01	/* Start bit               */

struct sh_rtc {
	void __iomem *regbase;
	unsigned long regsize;
	struct resource *res;
	unsigned int alarm_irq, periodic_irq, carry_irq;
	struct rtc_device *rtc_dev;
	spinlock_t lock;
};

static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
{
	struct platform_device *pdev = to_platform_device(dev_id);
	struct sh_rtc *rtc = platform_get_drvdata(pdev);
	unsigned int tmp, events = 0;

	spin_lock(&rtc->lock);

	tmp = readb(rtc->regbase + RCR1);

	if (tmp & RCR1_AF)
		events |= RTC_AF | RTC_IRQF;

	tmp &= ~(RCR1_CF | RCR1_AF);

	writeb(tmp, rtc->regbase + RCR1);

	rtc_update_irq(&rtc->rtc_dev->class_dev, 1, events);

	spin_unlock(&rtc->lock);

	return IRQ_HANDLED;
}

static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
{
	struct platform_device *pdev = to_platform_device(dev_id);
	struct sh_rtc *rtc = platform_get_drvdata(pdev);

	spin_lock(&rtc->lock);

	rtc_update_irq(&rtc->rtc_dev->class_dev, 1, RTC_PF | RTC_IRQF);

	spin_unlock(&rtc->lock);

	return IRQ_HANDLED;
}

static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
{
	struct sh_rtc *rtc = dev_get_drvdata(dev);
	unsigned int tmp;

	spin_lock_irq(&rtc->lock);

	tmp = readb(rtc->regbase + RCR2);

	if (enable) {
		tmp &= ~RCR2_PESMASK;
		tmp |= RCR2_PEF | (2 << 4);
	} else
		tmp &= ~(RCR2_PESMASK | RCR2_PEF);

	writeb(tmp, rtc->regbase + RCR2);

	spin_unlock_irq(&rtc->lock);
}

static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
{
	struct sh_rtc *rtc = dev_get_drvdata(dev);
	unsigned int tmp;

	spin_lock_irq(&rtc->lock);

	tmp = readb(rtc->regbase + RCR1);

	if (enable)
		tmp |= RCR1_AIE;
	else
		tmp &= ~RCR1_AIE;

	writeb(tmp, rtc->regbase + RCR1);

	spin_unlock_irq(&rtc->lock);
}

static int sh_rtc_open(struct device *dev)
{
	struct sh_rtc *rtc = dev_get_drvdata(dev);
	unsigned int tmp;
	int ret;

	tmp = readb(rtc->regbase + RCR1);
	tmp &= ~RCR1_CF;
	tmp |= RCR1_CIE;
	writeb(tmp, rtc->regbase + RCR1);

	ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
			  "sh-rtc period", dev);
	if (unlikely(ret)) {
		dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
			ret, rtc->periodic_irq);
		return ret;
	}

	ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
			  "sh-rtc carry", dev);
	if (unlikely(ret)) {
		dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
			ret, rtc->carry_irq);
		free_irq(rtc->periodic_irq, dev);
		goto err_bad_carry;
	}

	ret = request_irq(rtc->alarm_irq, sh_rtc_interrupt, IRQF_DISABLED,
			  "sh-rtc alarm", dev);
	if (unlikely(ret)) {
		dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
			ret, rtc->alarm_irq);
		goto err_bad_alarm;
	}

	return 0;

err_bad_alarm:
	free_irq(rtc->carry_irq, dev);
err_bad_carry:
	free_irq(rtc->periodic_irq, dev);

	return ret;
}

static void sh_rtc_release(struct device *dev)
{
	struct sh_rtc *rtc = dev_get_drvdata(dev);

	sh_rtc_setpie(dev, 0);

	free_irq(rtc->periodic_irq, dev);
	free_irq(rtc->carry_irq, dev);
	free_irq(rtc->alarm_irq, dev);
}

static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
{
	struct sh_rtc *rtc = dev_get_drvdata(dev);
	unsigned int tmp;

	tmp = readb(rtc->regbase + RCR1);
	seq_printf(seq, "alarm_IRQ\t: %s\n",
		   (tmp & RCR1_AIE) ? "yes" : "no");
	seq_printf(seq, "carry_IRQ\t: %s\n",
		   (tmp & RCR1_CIE) ? "yes" : "no");

	tmp = readb(rtc->regbase + RCR2);
	seq_printf(seq, "periodic_IRQ\t: %s\n",
		   (tmp & RCR2_PEF) ? "yes" : "no");

	return 0;
}

static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	unsigned int ret = -ENOIOCTLCMD;

	switch (cmd) {
	case RTC_PIE_OFF:
	case RTC_PIE_ON:
		sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
		ret = 0;
		break;
	case RTC_AIE_OFF:
	case RTC_AIE_ON:
		sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
		ret = 0;
		break;
	}

	return ret;
}

static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct sh_rtc *rtc = platform_get_drvdata(pdev);
	unsigned int sec128, sec2, yr, yr100, cf_bit;

	do {
		unsigned int tmp;

		spin_lock_irq(&rtc->lock);

		tmp = readb(rtc->regbase + RCR1);
		tmp &= ~RCR1_CF; /* Clear CF-bit */
		tmp |= RCR1_CIE;
		writeb(tmp, rtc->regbase + RCR1);

		sec128 = readb(rtc->regbase + R64CNT);

		tm->tm_sec	= BCD2BIN(readb(rtc->regbase + RSECCNT));
		tm->tm_min	= BCD2BIN(readb(rtc->regbase + RMINCNT));
		tm->tm_hour	= BCD2BIN(readb(rtc->regbase + RHRCNT));
		tm->tm_wday	= BCD2BIN(readb(rtc->regbase + RWKCNT));
		tm->tm_mday	= BCD2BIN(readb(rtc->regbase + RDAYCNT));
		tm->tm_mon	= BCD2BIN(readb(rtc->regbase + RMONCNT));

#if defined(CONFIG_CPU_SH4)
		yr  = readw(rtc->regbase + RYRCNT);
		yr100 = BCD2BIN(yr >> 8);
		yr &= 0xff;
#else
		yr  = readb(rtc->regbase + RYRCNT);
		yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
#endif

		tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;

		sec2 = readb(rtc->regbase + R64CNT);
		cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;

		spin_unlock_irq(&rtc->lock);
	} while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);

#if RTC_BIT_INVERTED != 0
	if ((sec128 & RTC_BIT_INVERTED))
		tm->tm_sec--;
#endif

	dev_dbg(&dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
		"mday=%d, mon=%d, year=%d, wday=%d\n",
		__FUNCTION__,
		tm->tm_sec, tm->tm_min, tm->tm_hour,
		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

	if (rtc_valid_tm(tm) < 0)
		dev_err(dev, "invalid date\n");

	return 0;
}

static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct sh_rtc *rtc = platform_get_drvdata(pdev);
	unsigned int tmp;
	int year;

	spin_lock_irq(&rtc->lock);

	/* Reset pre-scaler & stop RTC */
	tmp = readb(rtc->regbase + RCR2);
	tmp |= RCR2_RESET;
	writeb(tmp, rtc->regbase + RCR2);

	writeb(BIN2BCD(tm->tm_sec),  rtc->regbase + RSECCNT);
	writeb(BIN2BCD(tm->tm_min),  rtc->regbase + RMINCNT);
	writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
	writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
	writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
	writeb(BIN2BCD(tm->tm_mon),  rtc->regbase + RMONCNT);

#ifdef CONFIG_CPU_SH3
	year = tm->tm_year % 100;
	writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
#else
	year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
		BIN2BCD(tm->tm_year % 100);
	writew(year, rtc->regbase + RYRCNT);
#endif

	/* Start RTC */
	tmp = readb(rtc->regbase + RCR2);
	tmp &= ~RCR2_RESET;
	tmp |= RCR2_RTCEN | RCR2_START;
	writeb(tmp, rtc->regbase + RCR2);

	spin_unlock_irq(&rtc->lock);

	return 0;
}

static struct rtc_class_ops sh_rtc_ops = {
	.open		= sh_rtc_open,
	.release	= sh_rtc_release,
	.ioctl		= sh_rtc_ioctl,
	.read_time	= sh_rtc_read_time,
	.set_time	= sh_rtc_set_time,
	.proc		= sh_rtc_proc,
};

static int __devinit sh_rtc_probe(struct platform_device *pdev)
{
	struct sh_rtc *rtc;
	struct resource *res;
	int ret = -ENOENT;

	rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
	if (unlikely(!rtc))
		return -ENOMEM;

	spin_lock_init(&rtc->lock);

	rtc->periodic_irq = platform_get_irq(pdev, 0);
	if (unlikely(rtc->periodic_irq < 0)) {
		dev_err(&pdev->dev, "No IRQ for period\n");
		goto err_badres;
	}

	rtc->carry_irq = platform_get_irq(pdev, 1);
	if (unlikely(rtc->carry_irq < 0)) {
		dev_err(&pdev->dev, "No IRQ for carry\n");
		goto err_badres;
	}

	rtc->alarm_irq = platform_get_irq(pdev, 2);
	if (unlikely(rtc->alarm_irq < 0)) {
		dev_err(&pdev->dev, "No IRQ for alarm\n");
		goto err_badres;
	}

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (unlikely(res == NULL)) {
		dev_err(&pdev->dev, "No IO resource\n");
		goto err_badres;
	}

	rtc->regsize = res->end - res->start + 1;

	rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
	if (unlikely(!rtc->res)) {
		ret = -EBUSY;
		goto err_badres;
	}

	rtc->regbase = (void __iomem *)rtc->res->start;
	if (unlikely(!rtc->regbase)) {
		ret = -EINVAL;
		goto err_badmap;
	}

	rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
					   &sh_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc)) {
		ret = PTR_ERR(rtc->rtc_dev);
		goto err_badmap;
	}

	platform_set_drvdata(pdev, rtc);

	return 0;

err_badmap:
	release_resource(rtc->res);
err_badres:
	kfree(rtc);

	return ret;
}

static int __devexit sh_rtc_remove(struct platform_device *pdev)
{
	struct sh_rtc *rtc = platform_get_drvdata(pdev);

	if (likely(rtc->rtc_dev))
		rtc_device_unregister(rtc->rtc_dev);

	sh_rtc_setpie(&pdev->dev, 0);
	sh_rtc_setaie(&pdev->dev, 0);

	release_resource(rtc->res);

	platform_set_drvdata(pdev, NULL);

	kfree(rtc);

	return 0;
}
static struct platform_driver sh_rtc_platform_driver = {
	.driver		= {
		.name	= "sh-rtc",
		.owner	= THIS_MODULE,
	},
	.probe		= sh_rtc_probe,
	.remove		= __devexit_p(sh_rtc_remove),
};

static int __init sh_rtc_init(void)
{
	return platform_driver_register(&sh_rtc_platform_driver);
}

static void __exit sh_rtc_exit(void)
{
	platform_driver_unregister(&sh_rtc_platform_driver);
}

module_init(sh_rtc_init);
module_exit(sh_rtc_exit);

MODULE_DESCRIPTION("SuperH on-chip RTC driver");
MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
MODULE_LICENSE("GPL");
Commit	Line	Data
317a6104 PM	1	/*
	2	* SuperH On-Chip RTC Support
	3	*
	4	* Copyright (C) 2006 Paul Mundt
	5	*
	6	* Based on the old arch/sh/kernel/cpu/rtc.c by:
	7	*
	8	* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
	9	* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
	10	*
	11	* This file is subject to the terms and conditions of the GNU General Public
	12	* License. See the file "COPYING" in the main directory of this archive
	13	* for more details.
	14	*/
	15	#include <linux/module.h>
	16	#include <linux/kernel.h>
	17	#include <linux/bcd.h>
	18	#include <linux/rtc.h>
	19	#include <linux/init.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/seq_file.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/spinlock.h>
31ccb081	24	#include <linux/io.h>
317a6104 PM	25
	26	#ifdef CONFIG_CPU_SH3
	27	#define rtc_reg_size sizeof(u16)
	28	#define RTC_BIT_INVERTED 0 /* No bug on SH7708, SH7709A */
	29	#elif defined(CONFIG_CPU_SH4)
	30	#define rtc_reg_size sizeof(u32)
	31	#define RTC_BIT_INVERTED 0x40 /* bug on SH7750, SH7750S */
	32	#endif
	33
	34	#define RTC_REG(r) ((r) * rtc_reg_size)
	35
31ccb081 JL	36	#define R64CNT RTC_REG(0)
	37	#define RSECCNT RTC_REG(1)
	38	#define RMINCNT RTC_REG(2)
	39	#define RHRCNT RTC_REG(3)
	40	#define RWKCNT RTC_REG(4)
	41	#define RDAYCNT RTC_REG(5)
	42	#define RMONCNT RTC_REG(6)
	43	#define RYRCNT RTC_REG(7)
	44	#define RSECAR RTC_REG(8)
	45	#define RMINAR RTC_REG(9)
	46	#define RHRAR RTC_REG(10)
	47	#define RWKAR RTC_REG(11)
	48	#define RDAYAR RTC_REG(12)
	49	#define RMONAR RTC_REG(13)
	50	#define RCR1 RTC_REG(14)
	51	#define RCR2 RTC_REG(15)
317a6104 PM	52
	53	/* RCR1 Bits */
	54	#define RCR1_CF 0x80 /* Carry Flag */
	55	#define RCR1_CIE 0x10 /* Carry Interrupt Enable */
	56	#define RCR1_AIE 0x08 /* Alarm Interrupt Enable */
	57	#define RCR1_AF 0x01 /* Alarm Flag */
	58
	59	/* RCR2 Bits */
	60	#define RCR2_PEF 0x80 /* PEriodic interrupt Flag */
	61	#define RCR2_PESMASK 0x70 /* Periodic interrupt Set */
	62	#define RCR2_RTCEN 0x08 /* ENable RTC */
	63	#define RCR2_ADJ 0x04 /* ADJustment (30-second) */
	64	#define RCR2_RESET 0x02 /* Reset bit */
	65	#define RCR2_START 0x01 /* Start bit */
	66
	67	struct sh_rtc {
	68	void __iomem *regbase;
	69	unsigned long regsize;
	70	struct resource *res;
	71	unsigned int alarm_irq, periodic_irq, carry_irq;
	72	struct rtc_device *rtc_dev;
	73	spinlock_t lock;
	74	};
	75
31ccb081	76	static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
317a6104	77	{
31ccb081	78	struct platform_device *pdev = to_platform_device(dev_id);
317a6104 PM	79	struct sh_rtc *rtc = platform_get_drvdata(pdev);
	80	unsigned int tmp, events = 0;
	81
	82	spin_lock(&rtc->lock);
	83
	84	tmp = readb(rtc->regbase + RCR1);
	85
	86	if (tmp & RCR1_AF)
	87	events \|= RTC_AF \| RTC_IRQF;
	88
	89	tmp &= ~(RCR1_CF \| RCR1_AF);
	90
	91	writeb(tmp, rtc->regbase + RCR1);
	92
	93	rtc_update_irq(&rtc->rtc_dev->class_dev, 1, events);
	94
	95	spin_unlock(&rtc->lock);
	96
	97	return IRQ_HANDLED;
	98	}
	99
31ccb081	100	static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
317a6104	101	{
31ccb081 JL	102	struct platform_device *pdev = to_platform_device(dev_id);
31ccb081 JL	103	struct sh_rtc *rtc = platform_get_drvdata(pdev);
317a6104 PM	104
	105	spin_lock(&rtc->lock);
	106
	107	rtc_update_irq(&rtc->rtc_dev->class_dev, 1, RTC_PF \| RTC_IRQF);
	108
	109	spin_unlock(&rtc->lock);
	110
	111	return IRQ_HANDLED;
	112	}
	113
	114	static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
	115	{
	116	struct sh_rtc *rtc = dev_get_drvdata(dev);
	117	unsigned int tmp;
	118
	119	spin_lock_irq(&rtc->lock);
	120
	121	tmp = readb(rtc->regbase + RCR2);
	122
	123	if (enable) {
	124	tmp &= ~RCR2_PESMASK;
	125	tmp \|= RCR2_PEF \| (2 << 4);
	126	} else
	127	tmp &= ~(RCR2_PESMASK \| RCR2_PEF);
	128
	129	writeb(tmp, rtc->regbase + RCR2);
	130
	131	spin_unlock_irq(&rtc->lock);
	132	}
	133
	134	static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
	135	{
	136	struct sh_rtc *rtc = dev_get_drvdata(dev);
	137	unsigned int tmp;
	138
	139	spin_lock_irq(&rtc->lock);
	140
	141	tmp = readb(rtc->regbase + RCR1);
	142
	143	if (enable)
	144	tmp \|= RCR1_AIE;
	145	else
	146	tmp &= ~RCR1_AIE;
	147
	148	writeb(tmp, rtc->regbase + RCR1);
	149
	150	spin_unlock_irq(&rtc->lock);
	151	}
	152
	153	static int sh_rtc_open(struct device *dev)
	154	{
	155	struct sh_rtc *rtc = dev_get_drvdata(dev);
	156	unsigned int tmp;
	157	int ret;
	158
	159	tmp = readb(rtc->regbase + RCR1);
	160	tmp &= ~RCR1_CF;
	161	tmp \|= RCR1_CIE;
	162	writeb(tmp, rtc->regbase + RCR1);
	163
35f3c518	164	ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
317a6104 PM	165	"sh-rtc period", dev);
	166	if (unlikely(ret)) {
	167	dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
	168	ret, rtc->periodic_irq);
	169	return ret;
	170	}
	171
35f3c518	172	ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
317a6104 PM	173	"sh-rtc carry", dev);
	174	if (unlikely(ret)) {
	175	dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
	176	ret, rtc->carry_irq);
	177	free_irq(rtc->periodic_irq, dev);
	178	goto err_bad_carry;
	179	}
	180
35f3c518	181	ret = request_irq(rtc->alarm_irq, sh_rtc_interrupt, IRQF_DISABLED,
317a6104 PM	182	"sh-rtc alarm", dev);
	183	if (unlikely(ret)) {
	184	dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
	185	ret, rtc->alarm_irq);
	186	goto err_bad_alarm;
	187	}
	188
	189	return 0;
	190
	191	err_bad_alarm:
	192	free_irq(rtc->carry_irq, dev);
	193	err_bad_carry:
	194	free_irq(rtc->periodic_irq, dev);
	195
	196	return ret;
	197	}
	198
	199	static void sh_rtc_release(struct device *dev)
	200	{
	201	struct sh_rtc *rtc = dev_get_drvdata(dev);
	202
	203	sh_rtc_setpie(dev, 0);
	204
	205	free_irq(rtc->periodic_irq, dev);
	206	free_irq(rtc->carry_irq, dev);
	207	free_irq(rtc->alarm_irq, dev);
	208	}
	209
	210	static int sh_rtc_proc(struct device dev, struct seq_file seq)
	211	{
	212	struct sh_rtc *rtc = dev_get_drvdata(dev);
	213	unsigned int tmp;
	214
	215	tmp = readb(rtc->regbase + RCR1);
	216	seq_printf(seq, "alarm_IRQ\t: %s\n",
	217	(tmp & RCR1_AIE) ? "yes" : "no");
	218	seq_printf(seq, "carry_IRQ\t: %s\n",
	219	(tmp & RCR1_CIE) ? "yes" : "no");
	220
	221	tmp = readb(rtc->regbase + RCR2);
	222	seq_printf(seq, "periodic_IRQ\t: %s\n",
	223	(tmp & RCR2_PEF) ? "yes" : "no");
	224
	225	return 0;
	226	}
	227
	228	static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	229	{
	230	unsigned int ret = -ENOIOCTLCMD;
	231
	232	switch (cmd) {
	233	case RTC_PIE_OFF:
	234	case RTC_PIE_ON:
	235	sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
	236	ret = 0;
	237	break;
	238	case RTC_AIE_OFF:
	239	case RTC_AIE_ON:
	240	sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
	241	ret = 0;
	242	break;
	243	}
	244
	245	return ret;
246	}
247
248	static int sh_rtc_read_time(struct device dev, struct rtc_time tm)
249	{
250	struct platform_device *pdev = to_platform_device(dev);
251	struct sh_rtc *rtc = platform_get_drvdata(pdev);
252	unsigned int sec128, sec2, yr, yr100, cf_bit;
253
254	do {
255	unsigned int tmp;
256
257	spin_lock_irq(&rtc->lock);
258
259	tmp = readb(rtc->regbase + RCR1);
260	tmp &= ~RCR1_CF; /* Clear CF-bit */
261	tmp \|= RCR1_CIE;
262	writeb(tmp, rtc->regbase + RCR1);
263
264	sec128 = readb(rtc->regbase + R64CNT);
265
266	tm->tm_sec = BCD2BIN(readb(rtc->regbase + RSECCNT));
267	tm->tm_min = BCD2BIN(readb(rtc->regbase + RMINCNT));
268	tm->tm_hour = BCD2BIN(readb(rtc->regbase + RHRCNT));
269	tm->tm_wday = BCD2BIN(readb(rtc->regbase + RWKCNT));
270	tm->tm_mday = BCD2BIN(readb(rtc->regbase + RDAYCNT));
271	tm->tm_mon = BCD2BIN(readb(rtc->regbase + RMONCNT));
272
273	#if defined(CONFIG_CPU_SH4)
274	yr = readw(rtc->regbase + RYRCNT);
275	yr100 = BCD2BIN(yr >> 8);
276	yr &= 0xff;
277	#else
278	yr = readb(rtc->regbase + RYRCNT);
279	yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
280	#endif
281
282	tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
283
284	sec2 = readb(rtc->regbase + R64CNT);
285	cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
286
287	spin_unlock_irq(&rtc->lock);
288	} while (cf_bit != 0 \|\| ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
289
290	#if RTC_BIT_INVERTED != 0
291	if ((sec128 & RTC_BIT_INVERTED))
292	tm->tm_sec--;
293	#endif
294
295	dev_dbg(&dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
296	"mday=%d, mon=%d, year=%d, wday=%d\n",
297	__FUNCTION__,
298	tm->tm_sec, tm->tm_min, tm->tm_hour,
299	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
300
301	if (rtc_valid_tm(tm) < 0)
302	dev_err(dev, "invalid date\n");
303
304	return 0;
305	}
306
307	static int sh_rtc_set_time(struct device dev, struct rtc_time tm)
308	{
309	struct platform_device *pdev = to_platform_device(dev);
310	struct sh_rtc *rtc = platform_get_drvdata(pdev);
311	unsigned int tmp;
312	int year;
313
314	spin_lock_irq(&rtc->lock);
315
316	/* Reset pre-scaler & stop RTC */
317	tmp = readb(rtc->regbase + RCR2);
318	tmp \|= RCR2_RESET;
319	writeb(tmp, rtc->regbase + RCR2);
320
321	writeb(BIN2BCD(tm->tm_sec), rtc->regbase + RSECCNT);
322	writeb(BIN2BCD(tm->tm_min), rtc->regbase + RMINCNT);
323	writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
324	writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
325	writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
326	writeb(BIN2BCD(tm->tm_mon), rtc->regbase + RMONCNT);
327
328	#ifdef CONFIG_CPU_SH3
329	year = tm->tm_year % 100;
330	writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
331	#else
332	year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) \|
333	BIN2BCD(tm->tm_year % 100);
334	writew(year, rtc->regbase + RYRCNT);
335	#endif
336
337	/* Start RTC */
338	tmp = readb(rtc->regbase + RCR2);
339	tmp &= ~RCR2_RESET;
340	tmp \|= RCR2_RTCEN \| RCR2_START;
341	writeb(tmp, rtc->regbase + RCR2);
342
343	spin_unlock_irq(&rtc->lock);
344
345	return 0;
346	}
347
348	static struct rtc_class_ops sh_rtc_ops = {
349	.open = sh_rtc_open,
350	.release = sh_rtc_release,
351	.ioctl = sh_rtc_ioctl,
352	.read_time = sh_rtc_read_time,
353	.set_time = sh_rtc_set_time,
354	.proc = sh_rtc_proc,
355	};
356
357	static int __devinit sh_rtc_probe(struct platform_device *pdev)
358	{
359	struct sh_rtc *rtc;
360	struct resource *res;
361	int ret = -ENOENT;
362
363	rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
364	if (unlikely(!rtc))
365	return -ENOMEM;
366
367	spin_lock_init(&rtc->lock);
368
369	rtc->periodic_irq = platform_get_irq(pdev, 0);
370	if (unlikely(rtc->periodic_irq < 0)) {
371	dev_err(&pdev->dev, "No IRQ for period\n");
372	goto err_badres;
373	}
374
375	rtc->carry_irq = platform_get_irq(pdev, 1);
376	if (unlikely(rtc->carry_irq < 0)) {
377	dev_err(&pdev->dev, "No IRQ for carry\n");
378	goto err_badres;
379	}
380
381	rtc->alarm_irq = platform_get_irq(pdev, 2);
382	if (unlikely(rtc->alarm_irq < 0)) {
383	dev_err(&pdev->dev, "No IRQ for alarm\n");
384	goto err_badres;
385	}
386
387	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
388	if (unlikely(res == NULL)) {
389	dev_err(&pdev->dev, "No IO resource\n");
390	goto err_badres;
391	}
392
393	rtc->regsize = res->end - res->start + 1;
394
395	rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
396	if (unlikely(!rtc->res)) {
397	ret = -EBUSY;
398	goto err_badres;
399	}
400
401	rtc->regbase = (void __iomem *)rtc->res->start;
402	if (unlikely(!rtc->regbase)) {
403	ret = -EINVAL;
404	goto err_badmap;
405	}
406
407	rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
408	&sh_rtc_ops, THIS_MODULE);
409	if (IS_ERR(rtc)) {
410	ret = PTR_ERR(rtc->rtc_dev);
411	goto err_badmap;
412	}
413
414	platform_set_drvdata(pdev, rtc);
415
416	return 0;
417
418	err_badmap:
419	release_resource(rtc->res);
420	err_badres:
421	kfree(rtc);
422
423	return ret;
424	}
425
426	static int __devexit sh_rtc_remove(struct platform_device *pdev)
427	{
428	struct sh_rtc *rtc = platform_get_drvdata(pdev);
429
430	if (likely(rtc->rtc_dev))
431	rtc_device_unregister(rtc->rtc_dev);
432
433	sh_rtc_setpie(&pdev->dev, 0);
434	sh_rtc_setaie(&pdev->dev, 0);
435
436	release_resource(rtc->res);
437
438	platform_set_drvdata(pdev, NULL);
439
440	kfree(rtc);
441
442	return 0;
443	}
444	static struct platform_driver sh_rtc_platform_driver = {
445	.driver = {
446	.name = "sh-rtc",
447	.owner = THIS_MODULE,
448	},
449	.probe = sh_rtc_probe,
450	.remove = __devexit_p(sh_rtc_remove),
451	};
452
453	static int __init sh_rtc_init(void)
454	{
455	return platform_driver_register(&sh_rtc_platform_driver);
456	}
457
458	static void __exit sh_rtc_exit(void)
459	{
460	platform_driver_unregister(&sh_rtc_platform_driver);
461	}
462
463	module_init(sh_rtc_init);
464	module_exit(sh_rtc_exit);
465
466	MODULE_DESCRIPTION("SuperH on-chip RTC driver");
467	MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
468	MODULE_LICENSE("GPL");