[linux.git] / drivers / rtc / rtc-sa1100.c

/*
 * Real Time Clock interface for StrongARM SA1x00 and XScale PXA2xx
 *
 * Copyright (c) 2000 Nils Faerber
 *
 * Based on rtc.c by Paul Gortmaker
 *
 * Original Driver by Nils Faerber <[email protected]>
 *
 * Modifications from:
 *   CIH <[email protected]>
 *   Nicolas Pitre <[email protected]>
 *   Andrew Christian <[email protected]>
 *
 * Converted to the RTC subsystem and Driver Model
 *   by Richard Purdie <[email protected]>
 *
 * 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.
 */

#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/pm.h>

#include <asm/bitops.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/rtc.h>

#ifdef CONFIG_ARCH_PXA
#include <asm/arch/pxa-regs.h>
#endif

#define TIMER_FREQ		CLOCK_TICK_RATE
#define RTC_DEF_DIVIDER		32768 - 1
#define RTC_DEF_TRIM		0

static unsigned long rtc_freq = 1024;
static struct rtc_time rtc_alarm;
static DEFINE_SPINLOCK(sa1100_rtc_lock);

static int rtc_update_alarm(struct rtc_time *alrm)
{
	struct rtc_time alarm_tm, now_tm;
	unsigned long now, time;
	int ret;

	do {
		now = RCNR;
		rtc_time_to_tm(now, &now_tm);
		rtc_next_alarm_time(&alarm_tm, &now_tm, alrm);
		ret = rtc_tm_to_time(&alarm_tm, &time);
		if (ret != 0)
			break;

		RTSR = RTSR & (RTSR_HZE|RTSR_ALE|RTSR_AL);
		RTAR = time;
	} while (now != RCNR);

	return ret;
}

static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id,
		struct pt_regs *regs)
{
	struct platform_device *pdev = to_platform_device(dev_id);
	struct rtc_device *rtc = platform_get_drvdata(pdev);
	unsigned int rtsr;
	unsigned long events = 0;

	spin_lock(&sa1100_rtc_lock);

	rtsr = RTSR;
	/* clear interrupt sources */
	RTSR = 0;
	RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2);

	/* clear alarm interrupt if it has occurred */
	if (rtsr & RTSR_AL)
		rtsr &= ~RTSR_ALE;
	RTSR = rtsr & (RTSR_ALE | RTSR_HZE);

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

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

	if (rtsr & RTSR_AL && rtc_periodic_alarm(&rtc_alarm))
		rtc_update_alarm(&rtc_alarm);

	spin_unlock(&sa1100_rtc_lock);

	return IRQ_HANDLED;
}

static int rtc_timer1_count;

static irqreturn_t timer1_interrupt(int irq, void *dev_id,
		struct pt_regs *regs)
{
	struct platform_device *pdev = to_platform_device(dev_id);
	struct rtc_device *rtc = platform_get_drvdata(pdev);

	/*
	 * If we match for the first time, rtc_timer1_count will be 1.
	 * Otherwise, we wrapped around (very unlikely but
	 * still possible) so compute the amount of missed periods.
	 * The match reg is updated only when the data is actually retrieved
	 * to avoid unnecessary interrupts.
	 */
	OSSR = OSSR_M1;	/* clear match on timer1 */

	rtc_update_irq(&rtc->class_dev, rtc_timer1_count, RTC_PF | RTC_IRQF);

	if (rtc_timer1_count == 1)
		rtc_timer1_count = (rtc_freq * ((1<<30)/(TIMER_FREQ>>2)));

	return IRQ_HANDLED;
}

static int sa1100_rtc_read_callback(struct device *dev, int data)
{
	if (data & RTC_PF) {
		/* interpolate missed periods and set match for the next */
		unsigned long period = TIMER_FREQ/rtc_freq;
		unsigned long oscr = OSCR;
		unsigned long osmr1 = OSMR1;
		unsigned long missed = (oscr - osmr1)/period;
		data += missed << 8;
		OSSR = OSSR_M1;	/* clear match on timer 1 */
		OSMR1 = osmr1 + (missed + 1)*period;
		/* Ensure we didn't miss another match in the mean time.
		 * Here we compare (match - OSCR) 8 instead of 0 --
		 * see comment in pxa_timer_interrupt() for explanation.
		 */
		while( (signed long)((osmr1 = OSMR1) - OSCR) <= 8 ) {
			data += 0x100;
			OSSR = OSSR_M1;	/* clear match on timer 1 */
			OSMR1 = osmr1 + period;
		}
	}
	return data;
}

static int sa1100_rtc_open(struct device *dev)
{
	int ret;

	ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, SA_INTERRUPT,
				"rtc 1Hz", dev);
	if (ret) {
		dev_err(dev, "IRQ %d already in use.\n", IRQ_RTC1Hz);
		goto fail_ui;
	}
	ret = request_irq(IRQ_RTCAlrm, sa1100_rtc_interrupt, SA_INTERRUPT,
				"rtc Alrm", dev);
	if (ret) {
		dev_err(dev, "IRQ %d already in use.\n", IRQ_RTCAlrm);
		goto fail_ai;
	}
	ret = request_irq(IRQ_OST1, timer1_interrupt, SA_INTERRUPT,
				"rtc timer", dev);
	if (ret) {
		dev_err(dev, "IRQ %d already in use.\n", IRQ_OST1);
		goto fail_pi;
	}
	return 0;

 fail_pi:
	free_irq(IRQ_RTCAlrm, dev);
 fail_ai:
	free_irq(IRQ_RTC1Hz, dev);
 fail_ui:
	return ret;
}

static void sa1100_rtc_release(struct device *dev)
{
	spin_lock_irq(&sa1100_rtc_lock);
	RTSR = 0;
	OIER &= ~OIER_E1;
	OSSR = OSSR_M1;
	spin_unlock_irq(&sa1100_rtc_lock);

	free_irq(IRQ_OST1, dev);
	free_irq(IRQ_RTCAlrm, dev);
	free_irq(IRQ_RTC1Hz, dev);
}


static int sa1100_rtc_ioctl(struct device *dev, unsigned int cmd,
		unsigned long arg)
{
	switch(cmd) {
	case RTC_AIE_OFF:
		spin_lock_irq(&sa1100_rtc_lock);
		RTSR &= ~RTSR_ALE;
		spin_unlock_irq(&sa1100_rtc_lock);
		return 0;
	case RTC_AIE_ON:
		spin_lock_irq(&sa1100_rtc_lock);
		RTSR |= RTSR_ALE;
		spin_unlock_irq(&sa1100_rtc_lock);
		return 0;
	case RTC_UIE_OFF:
		spin_lock_irq(&sa1100_rtc_lock);
		RTSR &= ~RTSR_HZE;
		spin_unlock_irq(&sa1100_rtc_lock);
		return 0;
	case RTC_UIE_ON:
		spin_lock_irq(&sa1100_rtc_lock);
		RTSR |= RTSR_HZE;
		spin_unlock_irq(&sa1100_rtc_lock);
		return 0;
	case RTC_PIE_OFF:
		spin_lock_irq(&sa1100_rtc_lock);
		OIER &= ~OIER_E1;
		spin_unlock_irq(&sa1100_rtc_lock);
		return 0;
	case RTC_PIE_ON:
		spin_lock_irq(&sa1100_rtc_lock);
		OSMR1 = TIMER_FREQ/rtc_freq + OSCR;
		OIER |= OIER_E1;
		rtc_timer1_count = 1;
		spin_unlock_irq(&sa1100_rtc_lock);
		return 0;
	case RTC_IRQP_READ:
		return put_user(rtc_freq, (unsigned long *)arg);
	case RTC_IRQP_SET:
		if (arg < 1 || arg > TIMER_FREQ)
			return -EINVAL;
		rtc_freq = arg;
		return 0;
	}
	return -ENOIOCTLCMD;
}

static int sa1100_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	rtc_time_to_tm(RCNR, tm);
	return 0;
}

static int sa1100_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	unsigned long time;
	int ret;

	ret = rtc_tm_to_time(tm, &time);
	if (ret == 0)
		RCNR = time;
	return ret;
}

static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	memcpy(&alrm->time, &rtc_alarm, sizeof(struct rtc_time));
	alrm->pending = RTSR & RTSR_AL ? 1 : 0;
	return 0;
}

static int sa1100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	int ret;

	spin_lock_irq(&sa1100_rtc_lock);
	ret = rtc_update_alarm(&alrm->time);
	if (ret == 0) {
		memcpy(&rtc_alarm, &alrm->time, sizeof(struct rtc_time));

		if (alrm->enabled)
			enable_irq_wake(IRQ_RTCAlrm);
		else
			disable_irq_wake(IRQ_RTCAlrm);
	}
	spin_unlock_irq(&sa1100_rtc_lock);

	return ret;
}

static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq)
{
	seq_printf(seq, "trim/divider\t: 0x%08lx\n", RTTR);
	seq_printf(seq, "alarm_IRQ\t: %s\n",
			(RTSR & RTSR_ALE) ? "yes" : "no" );
	seq_printf(seq, "update_IRQ\t: %s\n",
			(RTSR & RTSR_HZE) ? "yes" : "no");
	seq_printf(seq, "periodic_IRQ\t: %s\n",
			(OIER & OIER_E1) ? "yes" : "no");
	seq_printf(seq, "periodic_freq\t: %ld\n", rtc_freq);

	return 0;
}

static struct rtc_class_ops sa1100_rtc_ops = {
	.open = sa1100_rtc_open,
	.read_callback = sa1100_rtc_read_callback,
	.release = sa1100_rtc_release,
	.ioctl = sa1100_rtc_ioctl,
	.read_time = sa1100_rtc_read_time,
	.set_time = sa1100_rtc_set_time,
	.read_alarm = sa1100_rtc_read_alarm,
	.set_alarm = sa1100_rtc_set_alarm,
	.proc = sa1100_rtc_proc,
};

static int sa1100_rtc_probe(struct platform_device *pdev)
{
	struct rtc_device *rtc;

	/*
	 * According to the manual we should be able to let RTTR be zero
	 * and then a default diviser for a 32.768KHz clock is used.
	 * Apparently this doesn't work, at least for my SA1110 rev 5.
	 * If the clock divider is uninitialized then reset it to the
	 * default value to get the 1Hz clock.
	 */
	if (RTTR == 0) {
		RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
		dev_warn(&pdev->dev, "warning: initializing default clock divider/trim value\n");
		/* The current RTC value probably doesn't make sense either */
		RCNR = 0;
	}

	rtc = rtc_device_register(pdev->name, &pdev->dev, &sa1100_rtc_ops,
				THIS_MODULE);

	if (IS_ERR(rtc))
		return PTR_ERR(rtc);

	platform_set_drvdata(pdev, rtc);

	return 0;
}

static int sa1100_rtc_remove(struct platform_device *pdev)
{
	struct rtc_device *rtc = platform_get_drvdata(pdev);

 	if (rtc)
		rtc_device_unregister(rtc);

	return 0;
}

static struct platform_driver sa1100_rtc_driver = {
	.probe		= sa1100_rtc_probe,
	.remove		= sa1100_rtc_remove,
	.driver		= {
		.name		= "sa1100-rtc",
	},
};

static int __init sa1100_rtc_init(void)
{
	return platform_driver_register(&sa1100_rtc_driver);
}

static void __exit sa1100_rtc_exit(void)
{
	platform_driver_unregister(&sa1100_rtc_driver);
}

module_init(sa1100_rtc_init);
module_exit(sa1100_rtc_exit);

MODULE_AUTHOR("Richard Purdie <[email protected]>");
MODULE_DESCRIPTION("SA11x0/PXA2xx Realtime Clock Driver (RTC)");
MODULE_LICENSE("GPL");
Commit	Line	Data
e842f1c8 RP	1	/*
	2	* Real Time Clock interface for StrongARM SA1x00 and XScale PXA2xx
	3	*
	4	* Copyright (c) 2000 Nils Faerber
	5	*
	6	* Based on rtc.c by Paul Gortmaker
	7	*
	8	* Original Driver by Nils Faerber <[email protected]>
	9	*
	10	* Modifications from:
	11	* CIH <[email protected]>
	12	* Nicolas Pitre <[email protected]>
	13	* Andrew Christian <[email protected]>
	14	*
	15	* Converted to the RTC subsystem and Driver Model
	16	* by Richard Purdie <[email protected]>
	17	*
	18	* This program is free software; you can redistribute it and/or
	19	* modify it under the terms of the GNU General Public License
	20	* as published by the Free Software Foundation; either version
	21	* 2 of the License, or (at your option) any later version.
	22	*/
	23
	24	#include <linux/platform_device.h>
	25	#include <linux/module.h>
	26	#include <linux/rtc.h>
	27	#include <linux/init.h>
	28	#include <linux/fs.h>
	29	#include <linux/interrupt.h>
	30	#include <linux/string.h>
	31	#include <linux/pm.h>
	32
	33	#include <asm/bitops.h>
	34	#include <asm/hardware.h>
	35	#include <asm/irq.h>
	36	#include <asm/rtc.h>
	37
	38	#ifdef CONFIG_ARCH_PXA
	39	#include <asm/arch/pxa-regs.h>
	40	#endif
	41
	42	#define TIMER_FREQ CLOCK_TICK_RATE
	43	#define RTC_DEF_DIVIDER 32768 - 1
	44	#define RTC_DEF_TRIM 0
	45
	46	static unsigned long rtc_freq = 1024;
	47	static struct rtc_time rtc_alarm;
34af946a	48	static DEFINE_SPINLOCK(sa1100_rtc_lock);
e842f1c8 RP	49
	50	static int rtc_update_alarm(struct rtc_time *alrm)
	51	{
	52	struct rtc_time alarm_tm, now_tm;
	53	unsigned long now, time;
	54	int ret;
	55
	56	do {
	57	now = RCNR;
	58	rtc_time_to_tm(now, &now_tm);
	59	rtc_next_alarm_time(&alarm_tm, &now_tm, alrm);
	60	ret = rtc_tm_to_time(&alarm_tm, &time);
	61	if (ret != 0)
	62	break;
	63
	64	RTSR = RTSR & (RTSR_HZE\|RTSR_ALE\|RTSR_AL);
	65	RTAR = time;
	66	} while (now != RCNR);
	67
	68	return ret;
	69	}
	70
	71	static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id,
	72	struct pt_regs *regs)
	73	{
	74	struct platform_device *pdev = to_platform_device(dev_id);
	75	struct rtc_device *rtc = platform_get_drvdata(pdev);
	76	unsigned int rtsr;
	77	unsigned long events = 0;
	78
	79	spin_lock(&sa1100_rtc_lock);
	80
	81	rtsr = RTSR;
	82	/* clear interrupt sources */
	83	RTSR = 0;
	84	RTSR = (RTSR_AL \| RTSR_HZ) & (rtsr >> 2);
	85
	86	/* clear alarm interrupt if it has occurred */
	87	if (rtsr & RTSR_AL)
	88	rtsr &= ~RTSR_ALE;
	89	RTSR = rtsr & (RTSR_ALE \| RTSR_HZE);
	90
	91	/* update irq data & counter */
	92	if (rtsr & RTSR_AL)
	93	events \|= RTC_AF \| RTC_IRQF;
	94	if (rtsr & RTSR_HZ)
	95	events \|= RTC_UF \| RTC_IRQF;
	96
	97	rtc_update_irq(&rtc->class_dev, 1, events);
	98
	99	if (rtsr & RTSR_AL && rtc_periodic_alarm(&rtc_alarm))
	100	rtc_update_alarm(&rtc_alarm);
	101
	102	spin_unlock(&sa1100_rtc_lock);
	103
	104	return IRQ_HANDLED;
	105	}
	106
	107	static int rtc_timer1_count;
	108
	109	static irqreturn_t timer1_interrupt(int irq, void *dev_id,
	110	struct pt_regs *regs)
	111	{
	112	struct platform_device *pdev = to_platform_device(dev_id);
113	struct rtc_device *rtc = platform_get_drvdata(pdev);
114
115	/*
116	* If we match for the first time, rtc_timer1_count will be 1.
117	* Otherwise, we wrapped around (very unlikely but
118	* still possible) so compute the amount of missed periods.
119	* The match reg is updated only when the data is actually retrieved
120	* to avoid unnecessary interrupts.
121	*/
122	OSSR = OSSR_M1; /* clear match on timer1 */
123
124	rtc_update_irq(&rtc->class_dev, rtc_timer1_count, RTC_PF \| RTC_IRQF);
125
126	if (rtc_timer1_count == 1)
127	rtc_timer1_count = (rtc_freq * ((1<<30)/(TIMER_FREQ>>2)));
128
129	return IRQ_HANDLED;
130	}
131
132	static int sa1100_rtc_read_callback(struct device *dev, int data)
133	{
134	if (data & RTC_PF) {
135	/* interpolate missed periods and set match for the next */
136	unsigned long period = TIMER_FREQ/rtc_freq;
137	unsigned long oscr = OSCR;
138	unsigned long osmr1 = OSMR1;
139	unsigned long missed = (oscr - osmr1)/period;
140	data += missed << 8;
141	OSSR = OSSR_M1; /* clear match on timer 1 */
142	OSMR1 = osmr1 + (missed + 1)*period;
143	/* Ensure we didn't miss another match in the mean time.
144	* Here we compare (match - OSCR) 8 instead of 0 --
145	* see comment in pxa_timer_interrupt() for explanation.
146	*/
147	while( (signed long)((osmr1 = OSMR1) - OSCR) <= 8 ) {
148	data += 0x100;
149	OSSR = OSSR_M1; /* clear match on timer 1 */
150	OSMR1 = osmr1 + period;
151	}
152	}
153	return data;
154	}
155
156	static int sa1100_rtc_open(struct device *dev)
157	{
158	int ret;
159
160	ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, SA_INTERRUPT,
161	"rtc 1Hz", dev);
162	if (ret) {
2260a25c	163	dev_err(dev, "IRQ %d already in use.\n", IRQ_RTC1Hz);
e842f1c8 RP	164	goto fail_ui;
	165	}
	166	ret = request_irq(IRQ_RTCAlrm, sa1100_rtc_interrupt, SA_INTERRUPT,
	167	"rtc Alrm", dev);
	168	if (ret) {
2260a25c	169	dev_err(dev, "IRQ %d already in use.\n", IRQ_RTCAlrm);
e842f1c8 RP	170	goto fail_ai;
	171	}
	172	ret = request_irq(IRQ_OST1, timer1_interrupt, SA_INTERRUPT,
	173	"rtc timer", dev);
	174	if (ret) {
2260a25c	175	dev_err(dev, "IRQ %d already in use.\n", IRQ_OST1);
e842f1c8 RP	176	goto fail_pi;
	177	}
	178	return 0;
	179
	180	fail_pi:
f1226701	181	free_irq(IRQ_RTCAlrm, dev);
e842f1c8	182	fail_ai:
f1226701	183	free_irq(IRQ_RTC1Hz, dev);
e842f1c8 RP	184	fail_ui:
	185	return ret;
	186	}
	187
	188	static void sa1100_rtc_release(struct device *dev)
	189	{
	190	spin_lock_irq(&sa1100_rtc_lock);
	191	RTSR = 0;
	192	OIER &= ~OIER_E1;
	193	OSSR = OSSR_M1;
	194	spin_unlock_irq(&sa1100_rtc_lock);
	195
	196	free_irq(IRQ_OST1, dev);
	197	free_irq(IRQ_RTCAlrm, dev);
	198	free_irq(IRQ_RTC1Hz, dev);
	199	}
	200
	201
	202	static int sa1100_rtc_ioctl(struct device *dev, unsigned int cmd,
	203	unsigned long arg)
	204	{
	205	switch(cmd) {
	206	case RTC_AIE_OFF:
	207	spin_lock_irq(&sa1100_rtc_lock);
	208	RTSR &= ~RTSR_ALE;
	209	spin_unlock_irq(&sa1100_rtc_lock);
	210	return 0;
	211	case RTC_AIE_ON:
	212	spin_lock_irq(&sa1100_rtc_lock);
	213	RTSR \|= RTSR_ALE;
	214	spin_unlock_irq(&sa1100_rtc_lock);
	215	return 0;
	216	case RTC_UIE_OFF:
	217	spin_lock_irq(&sa1100_rtc_lock);
	218	RTSR &= ~RTSR_HZE;
	219	spin_unlock_irq(&sa1100_rtc_lock);
	220	return 0;
	221	case RTC_UIE_ON:
	222	spin_lock_irq(&sa1100_rtc_lock);
	223	RTSR \|= RTSR_HZE;
	224	spin_unlock_irq(&sa1100_rtc_lock);
	225	return 0;
	226	case RTC_PIE_OFF:
	227	spin_lock_irq(&sa1100_rtc_lock);
	228	OIER &= ~OIER_E1;
	229	spin_unlock_irq(&sa1100_rtc_lock);
	230	return 0;
	231	case RTC_PIE_ON:
e842f1c8 RP	232	spin_lock_irq(&sa1100_rtc_lock);
	233	OSMR1 = TIMER_FREQ/rtc_freq + OSCR;
	234	OIER \|= OIER_E1;
	235	rtc_timer1_count = 1;
	236	spin_unlock_irq(&sa1100_rtc_lock);
	237	return 0;
	238	case RTC_IRQP_READ:
	239	return put_user(rtc_freq, (unsigned long *)arg);
	240	case RTC_IRQP_SET:
	241	if (arg < 1 \|\| arg > TIMER_FREQ)
	242	return -EINVAL;
e842f1c8 RP	243	rtc_freq = arg;
	244	return 0;
	245	}
b3969e58	246	return -ENOIOCTLCMD;
e842f1c8 RP	247	}
	248
	249	static int sa1100_rtc_read_time(struct device dev, struct rtc_time tm)
	250	{
	251	rtc_time_to_tm(RCNR, tm);
	252	return 0;
	253	}
	254
	255	static int sa1100_rtc_set_time(struct device dev, struct rtc_time tm)
	256	{
	257	unsigned long time;
	258	int ret;
	259
	260	ret = rtc_tm_to_time(tm, &time);
	261	if (ret == 0)
	262	RCNR = time;
	263	return ret;
	264	}
	265
	266	static int sa1100_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	267	{
	268	memcpy(&alrm->time, &rtc_alarm, sizeof(struct rtc_time));
	269	alrm->pending = RTSR & RTSR_AL ? 1 : 0;
	270	return 0;
	271	}
	272
	273	static int sa1100_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	274	{
	275	int ret;
	276
	277	spin_lock_irq(&sa1100_rtc_lock);
	278	ret = rtc_update_alarm(&alrm->time);
	279	if (ret == 0) {
	280	memcpy(&rtc_alarm, &alrm->time, sizeof(struct rtc_time));
	281
	282	if (alrm->enabled)
	283	enable_irq_wake(IRQ_RTCAlrm);
	284	else
	285	disable_irq_wake(IRQ_RTCAlrm);
	286	}
	287	spin_unlock_irq(&sa1100_rtc_lock);
	288
	289	return ret;
	290	}
	291
	292	static int sa1100_rtc_proc(struct device dev, struct seq_file seq)
	293	{
f1226701	294	seq_printf(seq, "trim/divider\t: 0x%08lx\n", RTTR);
e842f1c8 RP	295	seq_printf(seq, "alarm_IRQ\t: %s\n",
	296	(RTSR & RTSR_ALE) ? "yes" : "no" );
	297	seq_printf(seq, "update_IRQ\t: %s\n",
	298	(RTSR & RTSR_HZE) ? "yes" : "no");
	299	seq_printf(seq, "periodic_IRQ\t: %s\n",
	300	(OIER & OIER_E1) ? "yes" : "no");
	301	seq_printf(seq, "periodic_freq\t: %ld\n", rtc_freq);
	302
	303	return 0;
	304	}
	305
	306	static struct rtc_class_ops sa1100_rtc_ops = {
	307	.open = sa1100_rtc_open,
	308	.read_callback = sa1100_rtc_read_callback,
	309	.release = sa1100_rtc_release,
	310	.ioctl = sa1100_rtc_ioctl,
	311	.read_time = sa1100_rtc_read_time,
	312	.set_time = sa1100_rtc_set_time,
	313	.read_alarm = sa1100_rtc_read_alarm,
	314	.set_alarm = sa1100_rtc_set_alarm,
	315	.proc = sa1100_rtc_proc,
	316	};
	317
	318	static int sa1100_rtc_probe(struct platform_device *pdev)
	319	{
	320	struct rtc_device *rtc;
	321
	322	/*
	323	* According to the manual we should be able to let RTTR be zero
	324	* and then a default diviser for a 32.768KHz clock is used.
	325	* Apparently this doesn't work, at least for my SA1110 rev 5.
	326	* If the clock divider is uninitialized then reset it to the
	327	* default value to get the 1Hz clock.
	328	*/
	329	if (RTTR == 0) {
	330	RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
2260a25c	331	dev_warn(&pdev->dev, "warning: initializing default clock divider/trim value\n");
e842f1c8 RP	332	/* The current RTC value probably doesn't make sense either */
	333	RCNR = 0;
	334	}
	335
	336	rtc = rtc_device_register(pdev->name, &pdev->dev, &sa1100_rtc_ops,
	337	THIS_MODULE);
	338
2260a25c	339	if (IS_ERR(rtc))
e842f1c8	340	return PTR_ERR(rtc);
e842f1c8 RP	341
	342	platform_set_drvdata(pdev, rtc);
	343
e842f1c8 RP	344	return 0;
	345	}
	346
	347	static int sa1100_rtc_remove(struct platform_device *pdev)
	348	{
	349	struct rtc_device *rtc = platform_get_drvdata(pdev);
	350
	351	if (rtc)
	352	rtc_device_unregister(rtc);
	353
	354	return 0;
	355	}
	356
	357	static struct platform_driver sa1100_rtc_driver = {
	358	.probe = sa1100_rtc_probe,
	359	.remove = sa1100_rtc_remove,
	360	.driver = {
	361	.name = "sa1100-rtc",
	362	},
	363	};
	364
	365	static int __init sa1100_rtc_init(void)
	366	{
	367	return platform_driver_register(&sa1100_rtc_driver);
	368	}
	369
	370	static void __exit sa1100_rtc_exit(void)
	371	{
	372	platform_driver_unregister(&sa1100_rtc_driver);
	373	}
	374
	375	module_init(sa1100_rtc_init);
	376	module_exit(sa1100_rtc_exit);
	377
	378	MODULE_AUTHOR("Richard Purdie <[email protected]>");
	379	MODULE_DESCRIPTION("SA11x0/PXA2xx Realtime Clock Driver (RTC)");
	380	MODULE_LICENSE("GPL");