[linux.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_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 = {
	.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, const 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, 0,
			  "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 },
};

MODULE_DEVICE_TABLE(amba, pl030_ids);

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

module_amba_driver(pl030_driver);

MODULE_AUTHOR("Russell King <[email protected]>");
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_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	39	{
	40	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	41
	42	rtc_time_to_tm(readl(rtc->base + RTC_MR), &alrm->time);
	43	return 0;
	44	}
	45
	46	static int pl030_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	47	{
	48	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	49	unsigned long time;
	50	int ret;
	51
	52	/*
	53	* At the moment, we can only deal with non-wildcarded alarm times.
	54	*/
	55	ret = rtc_valid_tm(&alrm->time);
	56	if (ret == 0)
	57	ret = rtc_tm_to_time(&alrm->time, &time);
	58	if (ret == 0)
	59	writel(time, rtc->base + RTC_MR);
	60	return ret;
	61	}
	62
	63	static int pl030_read_time(struct device dev, struct rtc_time tm)
	64	{
	65	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	66
	67	rtc_time_to_tm(readl(rtc->base + RTC_DR), tm);
	68
	69	return 0;
	70	}
	71
	72	/*
	73	* Set the RTC time. Unfortunately, we can't accurately set
	74	* the point at which the counter updates.
	75	*
	76	* Also, since RTC_LR is transferred to RTC_CR on next rising
	77	* edge of the 1Hz clock, we must write the time one second
	78	* in advance.
	79	*/
	80	static int pl030_set_time(struct device dev, struct rtc_time tm)
	81	{
	82	struct pl030_rtc *rtc = dev_get_drvdata(dev);
	83	unsigned long time;
	84	int ret;
	85
	86	ret = rtc_tm_to_time(tm, &time);
	87	if (ret == 0)
	88	writel(time + 1, rtc->base + RTC_LR);
	89
	90	return ret;
	91	}
	92
	93	static const struct rtc_class_ops pl030_ops = {
a190901c RK	94	.read_time = pl030_read_time,
	95	.set_time = pl030_set_time,
	96	.read_alarm = pl030_read_alarm,
	97	.set_alarm = pl030_set_alarm,
	98	};
	99
aa25afad	100	static int pl030_probe(struct amba_device dev, const struct amba_id id)
a190901c RK	101	{
	102	struct pl030_rtc *rtc;
	103	int ret;
	104
	105	ret = amba_request_regions(dev, NULL);
	106	if (ret)
	107	goto err_req;
	108
	109	rtc = kmalloc(sizeof(*rtc), GFP_KERNEL);
	110	if (!rtc) {
	111	ret = -ENOMEM;
	112	goto err_rtc;
	113	}
	114
dc890c2d	115	rtc->base = ioremap(dev->res.start, resource_size(&dev->res));
a190901c RK	116	if (!rtc->base) {
	117	ret = -ENOMEM;
	118	goto err_map;
	119	}
	120
	121	__raw_writel(0, rtc->base + RTC_CR);
	122	__raw_writel(0, rtc->base + RTC_EOI);
	123
	124	amba_set_drvdata(dev, rtc);
	125
2f6e5f94	126	ret = request_irq(dev->irq[0], pl030_interrupt, 0,
a190901c RK	127	"rtc-pl030", rtc);
	128	if (ret)
	129	goto err_irq;
	130
	131	rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops,
	132	THIS_MODULE);
	133	if (IS_ERR(rtc->rtc)) {
	134	ret = PTR_ERR(rtc->rtc);
	135	goto err_reg;
	136	}
	137
	138	return 0;
	139
	140	err_reg:
	141	free_irq(dev->irq[0], rtc);
	142	err_irq:
	143	iounmap(rtc->base);
	144	err_map:
	145	kfree(rtc);
	146	err_rtc:
	147	amba_release_regions(dev);
	148	err_req:
	149	return ret;
	150	}
	151
	152	static int pl030_remove(struct amba_device *dev)
	153	{
	154	struct pl030_rtc *rtc = amba_get_drvdata(dev);
	155
	156	amba_set_drvdata(dev, NULL);
	157
	158	writel(0, rtc->base + RTC_CR);
	159
	160	free_irq(dev->irq[0], rtc);
	161	rtc_device_unregister(rtc->rtc);
	162	iounmap(rtc->base);
	163	kfree(rtc);
	164	amba_release_regions(dev);
	165
	166	return 0;
	167	}
	168
	169	static struct amba_id pl030_ids[] = {
	170	{
	171	.id = 0x00041030,
	172	.mask = 0x000fffff,
	173	},
	174	{ 0, 0 },
	175	};
	176
66bce591 DM	177	MODULE_DEVICE_TABLE(amba, pl030_ids);
66bce591 DM	178
a190901c RK	179	static struct amba_driver pl030_driver = {
	180	.drv = {
	181	.name = "rtc-pl030",
	182	},
	183	.probe = pl030_probe,
	184	.remove = pl030_remove,
	185	.id_table = pl030_ids,
	186	};
	187
9e5ed094	188	module_amba_driver(pl030_driver);
a190901c RK	189
	190	MODULE_AUTHOR("Russell King <[email protected]>");
	191	MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver");
	192	MODULE_LICENSE("GPL");