[net-next-2.6.git] / drivers / rtc / rtc-pl030.c

/*
 *  linux/drivers/rtc/rtc-pl030.c
 *
 *  Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/amba/bus.h>
#include <linux/io.h>
#include <linux/slab.h>

#define RTC_DR		(0)
#define RTC_MR		(4)
#define RTC_STAT	(8)
#define RTC_EOI		(8)
#define RTC_LR		(12)
#define RTC_CR		(16)
#define RTC_CR_MIE	(1 << 0)

struct pl030_rtc {
	struct rtc_device	*rtc;
	void __iomem		*base;
};

static irqreturn_t pl030_interrupt(int irq, void *dev_id)
{
	struct pl030_rtc *rtc = dev_id;
	writel(0, rtc->base + RTC_EOI);
	return IRQ_HANDLED;
}

static int pl030_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	return -ENOIOCTLCMD;
}

static int pl030_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pl030_rtc *rtc = dev_get_drvdata(dev);

	rtc_time_to_tm(readl(rtc->base + RTC_MR), &alrm->time);
	return 0;
}

static int pl030_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	unsigned long time;
	int ret;

	/*
	 * At the moment, we can only deal with non-wildcarded alarm times.
	 */
	ret = rtc_valid_tm(&alrm->time);
	if (ret == 0)
		ret = rtc_tm_to_time(&alrm->time, &time);
	if (ret == 0)
		writel(time, rtc->base + RTC_MR);
	return ret;
}

static int pl030_read_time(struct device *dev, struct rtc_time *tm)
{
	struct pl030_rtc *rtc = dev_get_drvdata(dev);

	rtc_time_to_tm(readl(rtc->base + RTC_DR), tm);

	return 0;
}

/*
 * Set the RTC time.  Unfortunately, we can't accurately set
 * the point at which the counter updates.
 *
 * Also, since RTC_LR is transferred to RTC_CR on next rising
 * edge of the 1Hz clock, we must write the time one second
 * in advance.
 */
static int pl030_set_time(struct device *dev, struct rtc_time *tm)
{
	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	unsigned long time;
	int ret;

	ret = rtc_tm_to_time(tm, &time);
	if (ret == 0)
		writel(time + 1, rtc->base + RTC_LR);

	return ret;
}

static const struct rtc_class_ops pl030_ops = {
	.ioctl		= pl030_ioctl,
	.read_time	= pl030_read_time,
	.set_time	= pl030_set_time,
	.read_alarm	= pl030_read_alarm,
	.set_alarm	= pl030_set_alarm,
};

static int pl030_probe(struct amba_device *dev, struct amba_id *id)
{
	struct pl030_rtc *rtc;
	int ret;

	ret = amba_request_regions(dev, NULL);
	if (ret)
		goto err_req;

	rtc = kmalloc(sizeof(*rtc), GFP_KERNEL);
	if (!rtc) {
		ret = -ENOMEM;
		goto err_rtc;
	}

	rtc->base = ioremap(dev->res.start, resource_size(&dev->res));
	if (!rtc->base) {
		ret = -ENOMEM;
		goto err_map;
	}

	__raw_writel(0, rtc->base + RTC_CR);
	__raw_writel(0, rtc->base + RTC_EOI);

	amba_set_drvdata(dev, rtc);

	ret = request_irq(dev->irq[0], pl030_interrupt, IRQF_DISABLED,
			  "rtc-pl030", rtc);
	if (ret)
		goto err_irq;

	rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops,
				       THIS_MODULE);
	if (IS_ERR(rtc->rtc)) {
		ret = PTR_ERR(rtc->rtc);
		goto err_reg;
	}

	return 0;

 err_reg:
	free_irq(dev->irq[0], rtc);
 err_irq:
	iounmap(rtc->base);
 err_map:
	kfree(rtc);
 err_rtc:
	amba_release_regions(dev);
 err_req:
	return ret;
}

static int pl030_remove(struct amba_device *dev)
{
	struct pl030_rtc *rtc = amba_get_drvdata(dev);

	amba_set_drvdata(dev, NULL);

	writel(0, rtc->base + RTC_CR);

	free_irq(dev->irq[0], rtc);
	rtc_device_unregister(rtc->rtc);
	iounmap(rtc->base);
	kfree(rtc);
	amba_release_regions(dev);

	return 0;
}

static struct amba_id pl030_ids[] = {
	{
		.id	= 0x00041030,
		.mask	= 0x000fffff,
	},
	{ 0, 0 },
};

static struct amba_driver pl030_driver = {
	.drv		= {
		.name	= "rtc-pl030",
	},
	.probe		= pl030_probe,
	.remove		= pl030_remove,
	.id_table	= pl030_ids,
};

static int __init pl030_init(void)
{
	return amba_driver_register(&pl030_driver);
}

static void __exit pl030_exit(void)
{
	amba_driver_unregister(&pl030_driver);
}

module_init(pl030_init);
module_exit(pl030_exit);

MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
a190901c RK	1	/*
	2	* linux/drivers/rtc/rtc-pl030.c
	3	*
	4	* Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
	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 version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10	#include <linux/module.h>
	11	#include <linux/rtc.h>
	12	#include <linux/init.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/amba/bus.h>
	15	#include <linux/io.h>
5a0e3ad6	16	#include <linux/slab.h>
a190901c RK	17
	18	#define RTC_DR (0)
	19	#define RTC_MR (4)
	20	#define RTC_STAT (8)
	21	#define RTC_EOI (8)
	22	#define RTC_LR (12)
	23	#define RTC_CR (16)
	24	#define RTC_CR_MIE (1 << 0)
	25
	26	struct pl030_rtc {
	27	struct rtc_device *rtc;
	28	void __iomem *base;
	29	};
	30
	31	static irqreturn_t pl030_interrupt(int irq, void *dev_id)
	32	{
	33	struct pl030_rtc *rtc = dev_id;
	34	writel(0, rtc->base + RTC_EOI);
	35	return IRQ_HANDLED;
	36	}
	37
a190901c RK	38	static int pl030_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	39	{
	40	return -ENOIOCTLCMD;
	41	}
	42
	43	static int pl030_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	44	{
	45	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	46
	47	rtc_time_to_tm(readl(rtc->base + RTC_MR), &alrm->time);
	48	return 0;
	49	}
	50
	51	static int pl030_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	52	{
	53	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	54	unsigned long time;
	55	int ret;
	56
	57	/*
	58	* At the moment, we can only deal with non-wildcarded alarm times.
	59	*/
	60	ret = rtc_valid_tm(&alrm->time);
	61	if (ret == 0)
	62	ret = rtc_tm_to_time(&alrm->time, &time);
	63	if (ret == 0)
	64	writel(time, rtc->base + RTC_MR);
	65	return ret;
	66	}
	67
	68	static int pl030_read_time(struct device dev, struct rtc_time tm)
	69	{
	70	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	71
	72	rtc_time_to_tm(readl(rtc->base + RTC_DR), tm);
	73
	74	return 0;
	75	}
	76
	77	/*
	78	* Set the RTC time. Unfortunately, we can't accurately set
	79	* the point at which the counter updates.
	80	*
	81	* Also, since RTC_LR is transferred to RTC_CR on next rising
	82	* edge of the 1Hz clock, we must write the time one second
	83	* in advance.
	84	*/
	85	static int pl030_set_time(struct device dev, struct rtc_time tm)
	86	{
	87	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	88	unsigned long time;
	89	int ret;
	90
	91	ret = rtc_tm_to_time(tm, &time);
	92	if (ret == 0)
	93	writel(time + 1, rtc->base + RTC_LR);
	94
	95	return ret;
	96	}
	97
	98	static const struct rtc_class_ops pl030_ops = {
a190901c RK	99	.ioctl = pl030_ioctl,
	100	.read_time = pl030_read_time,
	101	.set_time = pl030_set_time,
	102	.read_alarm = pl030_read_alarm,
	103	.set_alarm = pl030_set_alarm,
	104	};
	105
03fbdb15	106	static int pl030_probe(struct amba_device dev, struct amba_id id)
a190901c RK	107	{
	108	struct pl030_rtc *rtc;
	109	int ret;
	110
	111	ret = amba_request_regions(dev, NULL);
	112	if (ret)
	113	goto err_req;
	114
	115	rtc = kmalloc(sizeof(*rtc), GFP_KERNEL);
	116	if (!rtc) {
	117	ret = -ENOMEM;
	118	goto err_rtc;
	119	}
	120
dc890c2d	121	rtc->base = ioremap(dev->res.start, resource_size(&dev->res));
a190901c RK	122	if (!rtc->base) {
	123	ret = -ENOMEM;
	124	goto err_map;
	125	}
	126
	127	__raw_writel(0, rtc->base + RTC_CR);
	128	__raw_writel(0, rtc->base + RTC_EOI);
	129
	130	amba_set_drvdata(dev, rtc);
	131
	132	ret = request_irq(dev->irq[0], pl030_interrupt, IRQF_DISABLED,
	133	"rtc-pl030", rtc);
	134	if (ret)
	135	goto err_irq;
	136
	137	rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops,
	138	THIS_MODULE);
	139	if (IS_ERR(rtc->rtc)) {
	140	ret = PTR_ERR(rtc->rtc);
	141	goto err_reg;
	142	}
	143
	144	return 0;
	145
	146	err_reg:
	147	free_irq(dev->irq[0], rtc);
	148	err_irq:
	149	iounmap(rtc->base);
	150	err_map:
	151	kfree(rtc);
	152	err_rtc:
	153	amba_release_regions(dev);
	154	err_req:
	155	return ret;
	156	}
	157
	158	static int pl030_remove(struct amba_device *dev)
	159	{
	160	struct pl030_rtc *rtc = amba_get_drvdata(dev);
	161
	162	amba_set_drvdata(dev, NULL);
	163
	164	writel(0, rtc->base + RTC_CR);
	165
	166	free_irq(dev->irq[0], rtc);
	167	rtc_device_unregister(rtc->rtc);
	168	iounmap(rtc->base);
	169	kfree(rtc);
	170	amba_release_regions(dev);
	171
	172	return 0;
	173	}
	174
	175	static struct amba_id pl030_ids[] = {
	176	{
	177	.id = 0x00041030,
	178	.mask = 0x000fffff,
	179	},
	180	{ 0, 0 },
	181	};
	182
	183	static struct amba_driver pl030_driver = {
	184	.drv = {
	185	.name = "rtc-pl030",
186	},
187	.probe = pl030_probe,
188	.remove = pl030_remove,
189	.id_table = pl030_ids,
190	};
191
192	static int __init pl030_init(void)
193	{
194	return amba_driver_register(&pl030_driver);
195	}
196
197	static void __exit pl030_exit(void)
198	{
199	amba_driver_unregister(&pl030_driver);
200	}
201
202	module_init(pl030_init);
203	module_exit(pl030_exit);
204
205	MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
206	MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver");
207	MODULE_LICENSE("GPL");