[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 <asm/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 *id, struct pt_regs *regs)
{
	struct platform_device *pdev = 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 *id, struct pt_regs *regs)
{
	struct sh_rtc *rtc = dev_get_drvdata(id);

	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, SA_INTERRUPT,
			  "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, SA_INTERRUPT,
			  "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, SA_INTERRUPT,
			  "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>
	24	#include <asm/io.h>
	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
	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)
	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
76	static irqreturn_t sh_rtc_interrupt(int irq, void id, struct pt_regs regs)
77	{
78	struct platform_device *pdev = id;
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
100	static irqreturn_t sh_rtc_periodic(int irq, void id, struct pt_regs regs)
101	{
102	struct sh_rtc *rtc = dev_get_drvdata(id);
103
104	spin_lock(&rtc->lock);
105
106	rtc_update_irq(&rtc->rtc_dev->class_dev, 1, RTC_PF \| RTC_IRQF);
107
108	spin_unlock(&rtc->lock);
109
110	return IRQ_HANDLED;
111	}
112
113	static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
114	{
115	struct sh_rtc *rtc = dev_get_drvdata(dev);
116	unsigned int tmp;
117
118	spin_lock_irq(&rtc->lock);
119
120	tmp = readb(rtc->regbase + RCR2);
121
122	if (enable) {
123	tmp &= ~RCR2_PESMASK;
124	tmp \|= RCR2_PEF \| (2 << 4);
125	} else
126	tmp &= ~(RCR2_PESMASK \| RCR2_PEF);
127
128	writeb(tmp, rtc->regbase + RCR2);
129
130	spin_unlock_irq(&rtc->lock);
131	}
132
133	static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
134	{
135	struct sh_rtc *rtc = dev_get_drvdata(dev);
136	unsigned int tmp;
137
138	spin_lock_irq(&rtc->lock);
139
140	tmp = readb(rtc->regbase + RCR1);
141
142	if (enable)
143	tmp \|= RCR1_AIE;
144	else
145	tmp &= ~RCR1_AIE;
146
147	writeb(tmp, rtc->regbase + RCR1);
148
149	spin_unlock_irq(&rtc->lock);
150	}
151
152	static int sh_rtc_open(struct device *dev)
153	{
154	struct sh_rtc *rtc = dev_get_drvdata(dev);
155	unsigned int tmp;
156	int ret;
157
158	tmp = readb(rtc->regbase + RCR1);
159	tmp &= ~RCR1_CF;
160	tmp \|= RCR1_CIE;
161	writeb(tmp, rtc->regbase + RCR1);
162
163	ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, SA_INTERRUPT,
164	"sh-rtc period", dev);
165	if (unlikely(ret)) {
166	dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
167	ret, rtc->periodic_irq);
168	return ret;
169	}
170
171	ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, SA_INTERRUPT,
172	"sh-rtc carry", dev);
173	if (unlikely(ret)) {
174	dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
175	ret, rtc->carry_irq);
176	free_irq(rtc->periodic_irq, dev);
177	goto err_bad_carry;
178	}
179
180	ret = request_irq(rtc->alarm_irq, sh_rtc_interrupt, SA_INTERRUPT,
181	"sh-rtc alarm", dev);
182	if (unlikely(ret)) {
183	dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
184	ret, rtc->alarm_irq);
185	goto err_bad_alarm;
186	}
187
188	return 0;
189
190	err_bad_alarm:
191	free_irq(rtc->carry_irq, dev);
192	err_bad_carry:
193	free_irq(rtc->periodic_irq, dev);
194
195	return ret;
196	}
197
198	static void sh_rtc_release(struct device *dev)
199	{
200	struct sh_rtc *rtc = dev_get_drvdata(dev);
201
202	sh_rtc_setpie(dev, 0);
203
204	free_irq(rtc->periodic_irq, dev);
205	free_irq(rtc->carry_irq, dev);
206	free_irq(rtc->alarm_irq, dev);
207	}
208
209	static int sh_rtc_proc(struct device dev, struct seq_file seq)
210	{
211	struct sh_rtc *rtc = dev_get_drvdata(dev);
212	unsigned int tmp;
213
214	tmp = readb(rtc->regbase + RCR1);
215	seq_printf(seq, "alarm_IRQ\t: %s\n",
216	(tmp & RCR1_AIE) ? "yes" : "no");
217	seq_printf(seq, "carry_IRQ\t: %s\n",
218	(tmp & RCR1_CIE) ? "yes" : "no");
219
220	tmp = readb(rtc->regbase + RCR2);
221	seq_printf(seq, "periodic_IRQ\t: %s\n",
222	(tmp & RCR2_PEF) ? "yes" : "no");
223
224	return 0;
225	}
226
227	static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
228	{
229	unsigned int ret = -ENOIOCTLCMD;
230
231	switch (cmd) {
232	case RTC_PIE_OFF:
233	case RTC_PIE_ON:
234	sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
235	ret = 0;
236	break;
237	case RTC_AIE_OFF:
238	case RTC_AIE_ON:
239	sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
240	ret = 0;
241	break;
242	}
243
244	return ret;
245	}
246
247	static int sh_rtc_read_time(struct device dev, struct rtc_time tm)
248	{
249	struct platform_device *pdev = to_platform_device(dev);
250	struct sh_rtc *rtc = platform_get_drvdata(pdev);
251	unsigned int sec128, sec2, yr, yr100, cf_bit;
252
253	do {
254	unsigned int tmp;
255
256	spin_lock_irq(&rtc->lock);
257
258	tmp = readb(rtc->regbase + RCR1);
259	tmp &= ~RCR1_CF; /* Clear CF-bit */
260	tmp \|= RCR1_CIE;
261	writeb(tmp, rtc->regbase + RCR1);
262
263	sec128 = readb(rtc->regbase + R64CNT);
264
265	tm->tm_sec = BCD2BIN(readb(rtc->regbase + RSECCNT));
266	tm->tm_min = BCD2BIN(readb(rtc->regbase + RMINCNT));
267	tm->tm_hour = BCD2BIN(readb(rtc->regbase + RHRCNT));
268	tm->tm_wday = BCD2BIN(readb(rtc->regbase + RWKCNT));
269	tm->tm_mday = BCD2BIN(readb(rtc->regbase + RDAYCNT));
270	tm->tm_mon = BCD2BIN(readb(rtc->regbase + RMONCNT));
271
272	#if defined(CONFIG_CPU_SH4)
273	yr = readw(rtc->regbase + RYRCNT);
274	yr100 = BCD2BIN(yr >> 8);
275	yr &= 0xff;
276	#else
277	yr = readb(rtc->regbase + RYRCNT);
278	yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
279	#endif
280
281	tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
282
283	sec2 = readb(rtc->regbase + R64CNT);
284	cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
285
286	spin_unlock_irq(&rtc->lock);
287	} while (cf_bit != 0 \|\| ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
288
289	#if RTC_BIT_INVERTED != 0
290	if ((sec128 & RTC_BIT_INVERTED))
291	tm->tm_sec--;
292	#endif
293
294	dev_dbg(&dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
295	"mday=%d, mon=%d, year=%d, wday=%d\n",
296	__FUNCTION__,
297	tm->tm_sec, tm->tm_min, tm->tm_hour,
298	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
299
300	if (rtc_valid_tm(tm) < 0)
301	dev_err(dev, "invalid date\n");
302
303	return 0;
304	}
305
306	static int sh_rtc_set_time(struct device dev, struct rtc_time tm)
307	{
308	struct platform_device *pdev = to_platform_device(dev);
309	struct sh_rtc *rtc = platform_get_drvdata(pdev);
310	unsigned int tmp;
311	int year;
312
313	spin_lock_irq(&rtc->lock);
314
315	/* Reset pre-scaler & stop RTC */
316	tmp = readb(rtc->regbase + RCR2);
317	tmp \|= RCR2_RESET;
318	writeb(tmp, rtc->regbase + RCR2);
319
320	writeb(BIN2BCD(tm->tm_sec), rtc->regbase + RSECCNT);
321	writeb(BIN2BCD(tm->tm_min), rtc->regbase + RMINCNT);
322	writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
323	writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
324	writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
325	writeb(BIN2BCD(tm->tm_mon), rtc->regbase + RMONCNT);
326
327	#ifdef CONFIG_CPU_SH3
328	year = tm->tm_year % 100;
329	writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
330	#else
331	year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) \|
332	BIN2BCD(tm->tm_year % 100);
333	writew(year, rtc->regbase + RYRCNT);
334	#endif
335
336	/* Start RTC */
337	tmp = readb(rtc->regbase + RCR2);
338	tmp &= ~RCR2_RESET;
339	tmp \|= RCR2_RTCEN \| RCR2_START;
340	writeb(tmp, rtc->regbase + RCR2);
341
342	spin_unlock_irq(&rtc->lock);
343
344	return 0;
345	}
346
347	static struct rtc_class_ops sh_rtc_ops = {
348	.open = sh_rtc_open,
349	.release = sh_rtc_release,
350	.ioctl = sh_rtc_ioctl,
351	.read_time = sh_rtc_read_time,
352	.set_time = sh_rtc_set_time,
353	.proc = sh_rtc_proc,
354	};
355
356	static int __devinit sh_rtc_probe(struct platform_device *pdev)
357	{
358	struct sh_rtc *rtc;
359	struct resource *res;
360	int ret = -ENOENT;
361
362	rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
363	if (unlikely(!rtc))
364	return -ENOMEM;
365
366	spin_lock_init(&rtc->lock);
367
368	rtc->periodic_irq = platform_get_irq(pdev, 0);
369	if (unlikely(rtc->periodic_irq < 0)) {
370	dev_err(&pdev->dev, "No IRQ for period\n");
371	goto err_badres;
372	}
373
374	rtc->carry_irq = platform_get_irq(pdev, 1);
375	if (unlikely(rtc->carry_irq < 0)) {
376	dev_err(&pdev->dev, "No IRQ for carry\n");
377	goto err_badres;
378	}
379
380	rtc->alarm_irq = platform_get_irq(pdev, 2);
381	if (unlikely(rtc->alarm_irq < 0)) {
382	dev_err(&pdev->dev, "No IRQ for alarm\n");
383	goto err_badres;
384	}
385
386	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
387	if (unlikely(res == NULL)) {
388	dev_err(&pdev->dev, "No IO resource\n");
389	goto err_badres;
390	}
391
392	rtc->regsize = res->end - res->start + 1;
393
394	rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
395	if (unlikely(!rtc->res)) {
396	ret = -EBUSY;
397	goto err_badres;
398	}
399
400	rtc->regbase = (void __iomem *)rtc->res->start;
401	if (unlikely(!rtc->regbase)) {
402	ret = -EINVAL;
403	goto err_badmap;
404	}
405
406	rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
407	&sh_rtc_ops, THIS_MODULE);
408	if (IS_ERR(rtc)) {
409	ret = PTR_ERR(rtc->rtc_dev);
410	goto err_badmap;
411	}
412
413	platform_set_drvdata(pdev, rtc);
414
415	return 0;
416
417	err_badmap:
418	release_resource(rtc->res);
419	err_badres:
420	kfree(rtc);
421
422	return ret;
423	}
424
425	static int __devexit sh_rtc_remove(struct platform_device *pdev)
426	{
427	struct sh_rtc *rtc = platform_get_drvdata(pdev);
428
429	if (likely(rtc->rtc_dev))
430	rtc_device_unregister(rtc->rtc_dev);
431
432	sh_rtc_setpie(&pdev->dev, 0);
433	sh_rtc_setaie(&pdev->dev, 0);
434
435	release_resource(rtc->res);
436
437	platform_set_drvdata(pdev, NULL);
438
439	kfree(rtc);
440
441	return 0;
442	}
443	static struct platform_driver sh_rtc_platform_driver = {
444	.driver = {
445	.name = "sh-rtc",
446	.owner = THIS_MODULE,
447	},
448	.probe = sh_rtc_probe,
449	.remove = __devexit_p(sh_rtc_remove),
450	};
451
452	static int __init sh_rtc_init(void)
453	{
454	return platform_driver_register(&sh_rtc_platform_driver);
455	}
456
457	static void __exit sh_rtc_exit(void)
458	{
459	platform_driver_unregister(&sh_rtc_platform_driver);
460	}
461
462	module_init(sh_rtc_init);
463	module_exit(sh_rtc_exit);
464
465	MODULE_DESCRIPTION("SuperH on-chip RTC driver");
466	MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
467	MODULE_LICENSE("GPL");