[linux-block.git] / drivers / rtc / rtc-ep93xx.c

/*
 * A driver for the RTC embedded in the Cirrus Logic EP93XX processors
 * Copyright (c) 2006 Tower Technologies
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 *
 * 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/platform_device.h>
#include <linux/io.h>

#define EP93XX_RTC_DATA			0x000
#define EP93XX_RTC_MATCH		0x004
#define EP93XX_RTC_STATUS		0x008
#define  EP93XX_RTC_STATUS_INTR		 (1<<0)
#define EP93XX_RTC_LOAD			0x00C
#define EP93XX_RTC_CONTROL		0x010
#define  EP93XX_RTC_CONTROL_MIE		 (1<<0)
#define EP93XX_RTC_SWCOMP		0x108
#define  EP93XX_RTC_SWCOMP_DEL_MASK	 0x001f0000
#define  EP93XX_RTC_SWCOMP_DEL_SHIFT	 16
#define  EP93XX_RTC_SWCOMP_INT_MASK	 0x0000ffff
#define  EP93XX_RTC_SWCOMP_INT_SHIFT	 0

#define DRV_VERSION "0.3"

/*
 * struct device dev.platform_data is used to store our private data
 * because struct rtc_device does not have a variable to hold it.
 */
struct ep93xx_rtc {
	void __iomem	*mmio_base;
};

static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
				unsigned short *delete)
{
	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
	unsigned long comp;

	comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);

	if (preload)
		*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
				>> EP93XX_RTC_SWCOMP_INT_SHIFT;

	if (delete)
		*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
				>> EP93XX_RTC_SWCOMP_DEL_SHIFT;

	return 0;
}

static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
	unsigned long time;

	 time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);

	rtc_time_to_tm(time, tm);
	return 0;
}

static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
{
	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;

	__raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
	return 0;
}

static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
{
	unsigned short preload, delete;

	ep93xx_rtc_get_swcomp(dev, &preload, &delete);

	seq_printf(seq, "preload\t\t: %d\n", preload);
	seq_printf(seq, "delete\t\t: %d\n", delete);

	return 0;
}

static const struct rtc_class_ops ep93xx_rtc_ops = {
	.read_time	= ep93xx_rtc_read_time,
	.set_mmss	= ep93xx_rtc_set_mmss,
	.proc		= ep93xx_rtc_proc,
};

static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	unsigned short preload;

	ep93xx_rtc_get_swcomp(dev, &preload, NULL);

	return sprintf(buf, "%d\n", preload);
}
static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);

static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	unsigned short delete;

	ep93xx_rtc_get_swcomp(dev, NULL, &delete);

	return sprintf(buf, "%d\n", delete);
}
static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);


static int __init ep93xx_rtc_probe(struct platform_device *pdev)
{
	struct ep93xx_rtc *ep93xx_rtc;
	struct resource *res;
	struct rtc_device *rtc;
	int err;

	ep93xx_rtc = kzalloc(sizeof(struct ep93xx_rtc), GFP_KERNEL);
	if (ep93xx_rtc == NULL)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		err = -ENXIO;
		goto fail_free;
	}

	res = request_mem_region(res->start, resource_size(res), pdev->name);
	if (res == NULL) {
		err = -EBUSY;
		goto fail_free;
	}

	ep93xx_rtc->mmio_base = ioremap(res->start, resource_size(res));
	if (ep93xx_rtc->mmio_base == NULL) {
		err = -ENXIO;
		goto fail;
	}

	pdev->dev.platform_data = ep93xx_rtc;

	rtc = rtc_device_register(pdev->name,
				&pdev->dev, &ep93xx_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc)) {
		err = PTR_ERR(rtc);
		goto fail;
	}

	platform_set_drvdata(pdev, rtc);

	err = device_create_file(&pdev->dev, &dev_attr_comp_preload);
	if (err)
		goto fail;
	err = device_create_file(&pdev->dev, &dev_attr_comp_delete);
	if (err) {
		device_remove_file(&pdev->dev, &dev_attr_comp_preload);
		goto fail;
	}

	return 0;

fail:
	if (ep93xx_rtc->mmio_base) {
		iounmap(ep93xx_rtc->mmio_base);
		pdev->dev.platform_data = NULL;
	}
	release_mem_region(res->start, resource_size(res));
fail_free:
	kfree(ep93xx_rtc);
	return err;
}

static int __exit ep93xx_rtc_remove(struct platform_device *pdev)
{
	struct rtc_device *rtc = platform_get_drvdata(pdev);
	struct ep93xx_rtc *ep93xx_rtc = pdev->dev.platform_data;
	struct resource *res;

	/* cleanup sysfs */
	device_remove_file(&pdev->dev, &dev_attr_comp_delete);
	device_remove_file(&pdev->dev, &dev_attr_comp_preload);

	rtc_device_unregister(rtc);

	iounmap(ep93xx_rtc->mmio_base);
	pdev->dev.platform_data = NULL;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(res->start, resource_size(res));

	platform_set_drvdata(pdev, NULL);

	return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:ep93xx-rtc");

static struct platform_driver ep93xx_rtc_driver = {
	.driver		= {
		.name	= "ep93xx-rtc",
		.owner	= THIS_MODULE,
	},
	.remove		= __exit_p(ep93xx_rtc_remove),
};

static int __init ep93xx_rtc_init(void)
{
        return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe);
}

static void __exit ep93xx_rtc_exit(void)
{
	platform_driver_unregister(&ep93xx_rtc_driver);
}

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("EP93XX RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_init(ep93xx_rtc_init);
module_exit(ep93xx_rtc_exit);
Commit	Line	Data
fd507e2f AZ	1	/*
	2	* A driver for the RTC embedded in the Cirrus Logic EP93XX processors
	3	* Copyright (c) 2006 Tower Technologies
	4	*
	5	* Author: Alessandro Zummo <a.zummo@towertech.it>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/rtc.h>
	14	#include <linux/platform_device.h>
38f7b009 HS	15	#include <linux/io.h>
	16
	17	#define EP93XX_RTC_DATA 0x000
	18	#define EP93XX_RTC_MATCH 0x004
	19	#define EP93XX_RTC_STATUS 0x008
	20	#define EP93XX_RTC_STATUS_INTR (1<<0)
	21	#define EP93XX_RTC_LOAD 0x00C
	22	#define EP93XX_RTC_CONTROL 0x010
	23	#define EP93XX_RTC_CONTROL_MIE (1<<0)
	24	#define EP93XX_RTC_SWCOMP 0x108
	25	#define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000
	26	#define EP93XX_RTC_SWCOMP_DEL_SHIFT 16
	27	#define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff
	28	#define EP93XX_RTC_SWCOMP_INT_SHIFT 0
	29
	30	#define DRV_VERSION "0.3"
fd507e2f	31
38f7b009 HS	32	/*
	33	* struct device dev.platform_data is used to store our private data
	34	* because struct rtc_device does not have a variable to hold it.
	35	*/
	36	struct ep93xx_rtc {
	37	void __iomem *mmio_base;
	38	};
fd507e2f	39
38f7b009	40	static int ep93xx_rtc_get_swcomp(struct device dev, unsigned short preload,
fd507e2f AZ	41	unsigned short *delete)
fd507e2f AZ	42	{
38f7b009 HS	43	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
	44	unsigned long comp;
	45
	46	comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
fd507e2f AZ	47
fd507e2f AZ	48	if (preload)
38f7b009 HS	49	*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
38f7b009 HS	50	>> EP93XX_RTC_SWCOMP_INT_SHIFT;
fd507e2f AZ	51
fd507e2f AZ	52	if (delete)
38f7b009 HS	53	*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
38f7b009 HS	54	>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
fd507e2f AZ	55
	56	return 0;
	57	}
	58
	59	static int ep93xx_rtc_read_time(struct device dev, struct rtc_time tm)
	60	{
38f7b009 HS	61	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
	62	unsigned long time;
	63
	64	time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
fd507e2f AZ	65
	66	rtc_time_to_tm(time, tm);
	67	return 0;
	68	}
	69
	70	static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
	71	{
38f7b009 HS	72	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
	73
	74	__raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
fd507e2f AZ	75	return 0;
	76	}
	77
fd507e2f AZ	78	static int ep93xx_rtc_proc(struct device dev, struct seq_file seq)
	79	{
	80	unsigned short preload, delete;
	81
38f7b009	82	ep93xx_rtc_get_swcomp(dev, &preload, &delete);
fd507e2f	83
fd507e2f AZ	84	seq_printf(seq, "preload\t\t: %d\n", preload);
	85	seq_printf(seq, "delete\t\t: %d\n", delete);
	86
	87	return 0;
	88	}
	89
ff8371ac	90	static const struct rtc_class_ops ep93xx_rtc_ops = {
fd507e2f	91	.read_time = ep93xx_rtc_read_time,
fd507e2f AZ	92	.set_mmss = ep93xx_rtc_set_mmss,
	93	.proc = ep93xx_rtc_proc,
	94	};
	95
38f7b009	96	static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
fd507e2f AZ	97	struct device_attribute attr, char buf)
	98	{
	99	unsigned short preload;
	100
38f7b009	101	ep93xx_rtc_get_swcomp(dev, &preload, NULL);
fd507e2f AZ	102
	103	return sprintf(buf, "%d\n", preload);
	104	}
38f7b009	105	static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
fd507e2f	106
38f7b009	107	static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
fd507e2f AZ	108	struct device_attribute attr, char buf)
	109	{
	110	unsigned short delete;
	111
38f7b009	112	ep93xx_rtc_get_swcomp(dev, NULL, &delete);
fd507e2f AZ	113
	114	return sprintf(buf, "%d\n", delete);
	115	}
38f7b009	116	static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
fd507e2f AZ	117
fd507e2f AZ	118
38f7b009	119	static int __init ep93xx_rtc_probe(struct platform_device *pdev)
fd507e2f	120	{
38f7b009 HS	121	struct ep93xx_rtc *ep93xx_rtc;
	122	struct resource *res;
	123	struct rtc_device *rtc;
	124	int err;
	125
	126	ep93xx_rtc = kzalloc(sizeof(struct ep93xx_rtc), GFP_KERNEL);
	127	if (ep93xx_rtc == NULL)
	128	return -ENOMEM;
	129
	130	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
971370cc JL	131	if (res == NULL) {
	132	err = -ENXIO;
	133	goto fail_free;
	134	}
38f7b009 HS	135
38f7b009 HS	136	res = request_mem_region(res->start, resource_size(res), pdev->name);
971370cc JL	137	if (res == NULL) {
	138	err = -EBUSY;
	139	goto fail_free;
	140	}
38f7b009 HS	141
	142	ep93xx_rtc->mmio_base = ioremap(res->start, resource_size(res));
	143	if (ep93xx_rtc->mmio_base == NULL) {
	144	err = -ENXIO;
	145	goto fail;
	146	}
fd507e2f	147
38f7b009 HS	148	pdev->dev.platform_data = ep93xx_rtc;
	149
	150	rtc = rtc_device_register(pdev->name,
	151	&pdev->dev, &ep93xx_rtc_ops, THIS_MODULE);
fd507e2f	152	if (IS_ERR(rtc)) {
38f7b009 HS	153	err = PTR_ERR(rtc);
38f7b009 HS	154	goto fail;
fd507e2f AZ	155	}
fd507e2f AZ	156
38f7b009	157	platform_set_drvdata(pdev, rtc);
fd507e2f	158
38f7b009 HS	159	err = device_create_file(&pdev->dev, &dev_attr_comp_preload);
	160	if (err)
	161	goto fail;
	162	err = device_create_file(&pdev->dev, &dev_attr_comp_delete);
	163	if (err) {
	164	device_remove_file(&pdev->dev, &dev_attr_comp_preload);
	165	goto fail;
	166	}
fd507e2f AZ	167
fd507e2f AZ	168	return 0;
38f7b009 HS	169
	170	fail:
	171	if (ep93xx_rtc->mmio_base) {
	172	iounmap(ep93xx_rtc->mmio_base);
	173	pdev->dev.platform_data = NULL;
	174	}
	175	release_mem_region(res->start, resource_size(res));
971370cc JL	176	fail_free:
971370cc JL	177	kfree(ep93xx_rtc);
38f7b009	178	return err;
fd507e2f AZ	179	}
fd507e2f AZ	180
38f7b009	181	static int __exit ep93xx_rtc_remove(struct platform_device *pdev)
fd507e2f	182	{
38f7b009 HS	183	struct rtc_device *rtc = platform_get_drvdata(pdev);
	184	struct ep93xx_rtc *ep93xx_rtc = pdev->dev.platform_data;
	185	struct resource *res;
	186
	187	/* cleanup sysfs */
	188	device_remove_file(&pdev->dev, &dev_attr_comp_delete);
	189	device_remove_file(&pdev->dev, &dev_attr_comp_preload);
	190
	191	rtc_device_unregister(rtc);
	192
	193	iounmap(ep93xx_rtc->mmio_base);
	194	pdev->dev.platform_data = NULL;
fd507e2f	195
38f7b009 HS	196	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
38f7b009 HS	197	release_mem_region(res->start, resource_size(res));
fd507e2f	198
38f7b009	199	platform_set_drvdata(pdev, NULL);
fd507e2f AZ	200
	201	return 0;
	202	}
	203
ad28a07b KS	204	/* work with hotplug and coldplug */
	205	MODULE_ALIAS("platform:ep93xx-rtc");
	206
38f7b009	207	static struct platform_driver ep93xx_rtc_driver = {
fd507e2f AZ	208	.driver = {
	209	.name = "ep93xx-rtc",
	210	.owner = THIS_MODULE,
	211	},
38f7b009	212	.remove = __exit_p(ep93xx_rtc_remove),
fd507e2f AZ	213	};
	214
	215	static int __init ep93xx_rtc_init(void)
	216	{
38f7b009	217	return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe);
fd507e2f AZ	218	}
	219
	220	static void __exit ep93xx_rtc_exit(void)
	221	{
38f7b009	222	platform_driver_unregister(&ep93xx_rtc_driver);
fd507e2f AZ	223	}
	224
	225	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	226	MODULE_DESCRIPTION("EP93XX RTC driver");
	227	MODULE_LICENSE("GPL");
	228	MODULE_VERSION(DRV_VERSION);
	229
	230	module_init(ep93xx_rtc_init);
	231	module_exit(ep93xx_rtc_exit);