[deliverable/linux.git] / drivers / rtc / rtc-pl031.c

/*
 * drivers/rtc/rtc-pl031.c
 *
 * Real Time Clock interface for ARM AMBA PrimeCell 031 RTC
 *
 * Author: Deepak Saxena <dsaxena@plexity.net>
 *
 * Copyright 2006 (c) MontaVista Software, Inc.
 *
 * 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/module.h>
#include <linux/rtc.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/amba/bus.h>
#include <linux/io.h>

/*
 * Register definitions
 */
#define	RTC_DR		0x00	/* Data read register */
#define	RTC_MR		0x04	/* Match register */
#define	RTC_LR		0x08	/* Data load register */
#define	RTC_CR		0x0c	/* Control register */
#define	RTC_IMSC	0x10	/* Interrupt mask and set register */
#define	RTC_RIS		0x14	/* Raw interrupt status register */
#define	RTC_MIS		0x18	/* Masked interrupt status register */
#define	RTC_ICR		0x1c	/* Interrupt clear register */

struct pl031_local {
	struct rtc_device *rtc;
	void __iomem *base;
};

static irqreturn_t pl031_interrupt(int irq, void *dev_id)
{
	struct rtc_device *rtc = dev_id;

	rtc_update_irq(rtc, 1, RTC_AF);

	return IRQ_HANDLED;
}

static int pl031_open(struct device *dev)
{
	/*
	 * We request IRQ in pl031_probe, so nothing to do here...
	 */
	return 0;
}

static void pl031_release(struct device *dev)
{
}

static int pl031_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
	struct pl031_local *ldata = dev_get_drvdata(dev);

	switch (cmd) {
	case RTC_AIE_OFF:
		__raw_writel(1, ldata->base + RTC_MIS);
		return 0;
	case RTC_AIE_ON:
		__raw_writel(0, ldata->base + RTC_MIS);
		return 0;
	}

	return -ENOIOCTLCMD;
}

static int pl031_read_time(struct device *dev, struct rtc_time *tm)
{
	struct pl031_local *ldata = dev_get_drvdata(dev);

	rtc_time_to_tm(__raw_readl(ldata->base + RTC_DR), tm);

	return 0;
}

static int pl031_set_time(struct device *dev, struct rtc_time *tm)
{
	unsigned long time;
	struct pl031_local *ldata = dev_get_drvdata(dev);

	rtc_tm_to_time(tm, &time);
	__raw_writel(time, ldata->base + RTC_LR);

	return 0;
}

static int pl031_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct pl031_local *ldata = dev_get_drvdata(dev);

	rtc_time_to_tm(__raw_readl(ldata->base + RTC_MR), &alarm->time);
	alarm->pending = __raw_readl(ldata->base + RTC_RIS);
	alarm->enabled = __raw_readl(ldata->base + RTC_IMSC);

	return 0;
}

static int pl031_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct pl031_local *ldata = dev_get_drvdata(dev);
	unsigned long time;

	rtc_tm_to_time(&alarm->time, &time);

	__raw_writel(time, ldata->base + RTC_MR);
	__raw_writel(!alarm->enabled, ldata->base + RTC_MIS);

	return 0;
}

static const struct rtc_class_ops pl031_ops = {
	.open = pl031_open,
	.release = pl031_release,
	.ioctl = pl031_ioctl,
	.read_time = pl031_read_time,
	.set_time = pl031_set_time,
	.read_alarm = pl031_read_alarm,
	.set_alarm = pl031_set_alarm,
};

static int pl031_remove(struct amba_device *adev)
{
	struct pl031_local *ldata = dev_get_drvdata(&adev->dev);

	amba_set_drvdata(adev, NULL);
	free_irq(adev->irq[0], ldata->rtc);
	rtc_device_unregister(ldata->rtc);
	iounmap(ldata->base);
	kfree(ldata);
	amba_release_regions(adev);

	return 0;
}

static int pl031_probe(struct amba_device *adev, void *id)
{
	int ret;
	struct pl031_local *ldata;

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

	ldata = kmalloc(sizeof(struct pl031_local), GFP_KERNEL);
	if (!ldata) {
		ret = -ENOMEM;
		goto out;
	}

	ldata->base = ioremap(adev->res.start,
			      adev->res.end - adev->res.start + 1);
	if (!ldata->base) {
		ret = -ENOMEM;
		goto out_no_remap;
	}

	amba_set_drvdata(adev, ldata);

	if (request_irq(adev->irq[0], pl031_interrupt, IRQF_DISABLED,
			"rtc-pl031", ldata->rtc)) {
		ret = -EIO;
		goto out_no_irq;
	}

	ldata->rtc = rtc_device_register("pl031", &adev->dev, &pl031_ops,
					 THIS_MODULE);
	if (IS_ERR(ldata->rtc)) {
		ret = PTR_ERR(ldata->rtc);
		goto out_no_rtc;
	}

	return 0;

out_no_rtc:
	free_irq(adev->irq[0], ldata->rtc);
out_no_irq:
	iounmap(ldata->base);
	amba_set_drvdata(adev, NULL);
out_no_remap:
	kfree(ldata);
out:
	amba_release_regions(adev);
err_req:
	return ret;
}

static struct amba_id pl031_ids[] __initdata = {
	{
		 .id = 0x00041031,
	 	.mask = 0x000fffff, },
	{0, 0},
};

static struct amba_driver pl031_driver = {
	.drv = {
		.name = "rtc-pl031",
	},
	.id_table = pl031_ids,
	.probe = pl031_probe,
	.remove = pl031_remove,
};

static int __init pl031_init(void)
{
	return amba_driver_register(&pl031_driver);
}

static void __exit pl031_exit(void)
{
	amba_driver_unregister(&pl031_driver);
}

module_init(pl031_init);
module_exit(pl031_exit);

MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net");
MODULE_DESCRIPTION("ARM AMBA PL031 RTC Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
8ae6e163 DS	1	/*
	2	* drivers/rtc/rtc-pl031.c
	3	*
	4	* Real Time Clock interface for ARM AMBA PrimeCell 031 RTC
	5	*
	6	* Author: Deepak Saxena <dsaxena@plexity.net>
	7	*
	8	* Copyright 2006 (c) MontaVista Software, Inc.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
8ae6e163 DS	15	#include <linux/module.h>
	16	#include <linux/rtc.h>
	17	#include <linux/init.h>
8ae6e163	18	#include <linux/interrupt.h>
8ae6e163	19	#include <linux/amba/bus.h>
2dba8518	20	#include <linux/io.h>
8ae6e163 DS	21
	22	/*
	23	* Register definitions
	24	*/
	25	#define RTC_DR 0x00 /* Data read register */
	26	#define RTC_MR 0x04 /* Match register */
	27	#define RTC_LR 0x08 /* Data load register */
	28	#define RTC_CR 0x0c /* Control register */
	29	#define RTC_IMSC 0x10 /* Interrupt mask and set register */
	30	#define RTC_RIS 0x14 /* Raw interrupt status register */
	31	#define RTC_MIS 0x18 /* Masked interrupt status register */
	32	#define RTC_ICR 0x1c /* Interrupt clear register */
	33
	34	struct pl031_local {
	35	struct rtc_device *rtc;
	36	void __iomem *base;
	37	};
	38
7d12e780	39	static irqreturn_t pl031_interrupt(int irq, void *dev_id)
8ae6e163 DS	40	{
	41	struct rtc_device *rtc = dev_id;
	42
ab6a2d70	43	rtc_update_irq(rtc, 1, RTC_AF);
8ae6e163 DS	44
	45	return IRQ_HANDLED;
	46	}
	47
	48	static int pl031_open(struct device *dev)
	49	{
	50	/*
	51	* We request IRQ in pl031_probe, so nothing to do here...
	52	*/
	53	return 0;
	54	}
	55
	56	static void pl031_release(struct device *dev)
	57	{
	58	}
	59
	60	static int pl031_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	61	{
	62	struct pl031_local *ldata = dev_get_drvdata(dev);
	63
	64	switch (cmd) {
	65	case RTC_AIE_OFF:
	66	__raw_writel(1, ldata->base + RTC_MIS);
	67	return 0;
	68	case RTC_AIE_ON:
	69	__raw_writel(0, ldata->base + RTC_MIS);
	70	return 0;
	71	}
	72
	73	return -ENOIOCTLCMD;
	74	}
	75
	76	static int pl031_read_time(struct device dev, struct rtc_time tm)
	77	{
	78	struct pl031_local *ldata = dev_get_drvdata(dev);
	79
	80	rtc_time_to_tm(__raw_readl(ldata->base + RTC_DR), tm);
	81
	82	return 0;
	83	}
	84
	85	static int pl031_set_time(struct device dev, struct rtc_time tm)
	86	{
	87	unsigned long time;
	88	struct pl031_local *ldata = dev_get_drvdata(dev);
	89
	90	rtc_tm_to_time(tm, &time);
	91	__raw_writel(time, ldata->base + RTC_LR);
	92
	93	return 0;
	94	}
	95
	96	static int pl031_read_alarm(struct device dev, struct rtc_wkalrm alarm)
	97	{
	98	struct pl031_local *ldata = dev_get_drvdata(dev);
	99
	100	rtc_time_to_tm(__raw_readl(ldata->base + RTC_MR), &alarm->time);
	101	alarm->pending = __raw_readl(ldata->base + RTC_RIS);
	102	alarm->enabled = __raw_readl(ldata->base + RTC_IMSC);
	103
	104	return 0;
	105	}
	106
	107	static int pl031_set_alarm(struct device dev, struct rtc_wkalrm alarm)
108	{
109	struct pl031_local *ldata = dev_get_drvdata(dev);
110	unsigned long time;
111
112	rtc_tm_to_time(&alarm->time, &time);
113
114	__raw_writel(time, ldata->base + RTC_MR);
115	__raw_writel(!alarm->enabled, ldata->base + RTC_MIS);
116
117	return 0;
118	}
119
ff8371ac	120	static const struct rtc_class_ops pl031_ops = {
8ae6e163 DS	121	.open = pl031_open,
	122	.release = pl031_release,
	123	.ioctl = pl031_ioctl,
	124	.read_time = pl031_read_time,
	125	.set_time = pl031_set_time,
	126	.read_alarm = pl031_read_alarm,
	127	.set_alarm = pl031_set_alarm,
	128	};
	129
	130	static int pl031_remove(struct amba_device *adev)
	131	{
	132	struct pl031_local *ldata = dev_get_drvdata(&adev->dev);
	133
2dba8518 RK	134	amba_set_drvdata(adev, NULL);
	135	free_irq(adev->irq[0], ldata->rtc);
	136	rtc_device_unregister(ldata->rtc);
	137	iounmap(ldata->base);
	138	kfree(ldata);
	139	amba_release_regions(adev);
8ae6e163 DS	140
	141	return 0;
	142	}
	143
	144	static int pl031_probe(struct amba_device adev, void id)
	145	{
	146	int ret;
	147	struct pl031_local *ldata;
	148
2dba8518 RK	149	ret = amba_request_regions(adev, NULL);
	150	if (ret)
	151	goto err_req;
8ae6e163 DS	152
	153	ldata = kmalloc(sizeof(struct pl031_local), GFP_KERNEL);
	154	if (!ldata) {
	155	ret = -ENOMEM;
	156	goto out;
	157	}
8ae6e163 DS	158
	159	ldata->base = ioremap(adev->res.start,
	160	adev->res.end - adev->res.start + 1);
	161	if (!ldata->base) {
	162	ret = -ENOMEM;
	163	goto out_no_remap;
	164	}
	165
2dba8518 RK	166	amba_set_drvdata(adev, ldata);
2dba8518 RK	167
dace1453	168	if (request_irq(adev->irq[0], pl031_interrupt, IRQF_DISABLED,
8ae6e163 DS	169	"rtc-pl031", ldata->rtc)) {
	170	ret = -EIO;
	171	goto out_no_irq;
	172	}
	173
	174	ldata->rtc = rtc_device_register("pl031", &adev->dev, &pl031_ops,
	175	THIS_MODULE);
	176	if (IS_ERR(ldata->rtc)) {
	177	ret = PTR_ERR(ldata->rtc);
	178	goto out_no_rtc;
	179	}
	180
	181	return 0;
	182
	183	out_no_rtc:
	184	free_irq(adev->irq[0], ldata->rtc);
	185	out_no_irq:
	186	iounmap(ldata->base);
2dba8518	187	amba_set_drvdata(adev, NULL);
8ae6e163	188	out_no_remap:
8ae6e163 DS	189	kfree(ldata);
8ae6e163 DS	190	out:
2dba8518 RK	191	amba_release_regions(adev);
2dba8518 RK	192	err_req:
8ae6e163 DS	193	return ret;
	194	}
	195
	196	static struct amba_id pl031_ids[] __initdata = {
	197	{
	198	.id = 0x00041031,
	199	.mask = 0x000fffff, },
	200	{0, 0},
	201	};
	202
	203	static struct amba_driver pl031_driver = {
	204	.drv = {
	205	.name = "rtc-pl031",
	206	},
	207	.id_table = pl031_ids,
	208	.probe = pl031_probe,
	209	.remove = pl031_remove,
	210	};
	211
	212	static int __init pl031_init(void)
	213	{
	214	return amba_driver_register(&pl031_driver);
	215	}
	216
	217	static void __exit pl031_exit(void)
	218	{
	219	amba_driver_unregister(&pl031_driver);
	220	}
	221
	222	module_init(pl031_init);
	223	module_exit(pl031_exit);
	224
	225	MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net");
	226	MODULE_DESCRIPTION("ARM AMBA PL031 RTC Driver");
	227	MODULE_LICENSE("GPL");