[linux-2.6-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>
#include <linux/gfp.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

/*
 * 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;
	struct rtc_device *rtc;
};

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

	comp = 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_get_platdata(dev);
	unsigned long time;

	 time = 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_get_platdata(dev);

	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 struct attribute *ep93xx_rtc_attrs[] = {
	&dev_attr_comp_preload.attr,
	&dev_attr_comp_delete.attr,
	NULL
};

static const struct attribute_group ep93xx_rtc_sysfs_files = {
	.attrs	= ep93xx_rtc_attrs,
};

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

	ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
	if (!ep93xx_rtc)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ep93xx_rtc->mmio_base))
		return PTR_ERR(ep93xx_rtc->mmio_base);

	pdev->dev.platform_data = ep93xx_rtc;
	platform_set_drvdata(pdev, ep93xx_rtc);

	ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev,
				pdev->name, &ep93xx_rtc_ops, THIS_MODULE);
	if (IS_ERR(ep93xx_rtc->rtc)) {
		err = PTR_ERR(ep93xx_rtc->rtc);
		goto exit;
	}

	err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
	if (err)
		goto exit;

	return 0;

exit:
	pdev->dev.platform_data = NULL;
	return err;
}

static int ep93xx_rtc_remove(struct platform_device *pdev)
{
	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
	pdev->dev.platform_data = NULL;

	return 0;
}

static struct platform_driver ep93xx_rtc_driver = {
	.driver		= {
		.name	= "ep93xx-rtc",
	},
	.probe		= ep93xx_rtc_probe,
	.remove		= ep93xx_rtc_remove,
};

module_platform_driver(ep93xx_rtc_driver);

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("EP93XX RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ep93xx-rtc");
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	15	#include <linux/io.h>
5a0e3ad6	16	#include <linux/gfp.h>
38f7b009 HS	17
	18	#define EP93XX_RTC_DATA 0x000
	19	#define EP93XX_RTC_MATCH 0x004
	20	#define EP93XX_RTC_STATUS 0x008
	21	#define EP93XX_RTC_STATUS_INTR (1<<0)
	22	#define EP93XX_RTC_LOAD 0x00C
	23	#define EP93XX_RTC_CONTROL 0x010
	24	#define EP93XX_RTC_CONTROL_MIE (1<<0)
	25	#define EP93XX_RTC_SWCOMP 0x108
	26	#define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000
	27	#define EP93XX_RTC_SWCOMP_DEL_SHIFT 16
	28	#define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff
	29	#define EP93XX_RTC_SWCOMP_INT_SHIFT 0
	30
38f7b009 HS	31	/*
	32	* struct device dev.platform_data is used to store our private data
	33	* because struct rtc_device does not have a variable to hold it.
	34	*/
	35	struct ep93xx_rtc {
	36	void __iomem *mmio_base;
bf6ed027	37	struct rtc_device *rtc;
38f7b009	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	{
28dc5f80	43	struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
38f7b009 HS	44	unsigned long comp;
38f7b009 HS	45
ff32ff17	46	comp = 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	{
28dc5f80	61	struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
38f7b009 HS	62	unsigned long time;
38f7b009 HS	63
ff32ff17	64	time = 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	{
28dc5f80	72	struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
38f7b009	73
ff32ff17	74	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	117
b4877d2b HS	118	static struct attribute *ep93xx_rtc_attrs[] = {
	119	&dev_attr_comp_preload.attr,
	120	&dev_attr_comp_delete.attr,
	121	NULL
	122	};
	123
	124	static const struct attribute_group ep93xx_rtc_sysfs_files = {
	125	.attrs = ep93xx_rtc_attrs,
	126	};
fd507e2f	127
5a167f45	128	static int ep93xx_rtc_probe(struct platform_device *pdev)
fd507e2f	129	{
38f7b009 HS	130	struct ep93xx_rtc *ep93xx_rtc;
38f7b009 HS	131	struct resource *res;
38f7b009 HS	132	int err;
38f7b009 HS	133
b4877d2b HS	134	ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
b4877d2b HS	135	if (!ep93xx_rtc)
38f7b009 HS	136	return -ENOMEM;
	137
	138	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
7c1d69ee JL	139	ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res);
	140	if (IS_ERR(ep93xx_rtc->mmio_base))
	141	return PTR_ERR(ep93xx_rtc->mmio_base);
fd507e2f	142
38f7b009	143	pdev->dev.platform_data = ep93xx_rtc;
bf6ed027	144	platform_set_drvdata(pdev, ep93xx_rtc);
38f7b009	145
5d65cbfb JH	146	ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev,
5d65cbfb JH	147	pdev->name, &ep93xx_rtc_ops, THIS_MODULE);
bf6ed027 AL	148	if (IS_ERR(ep93xx_rtc->rtc)) {
bf6ed027 AL	149	err = PTR_ERR(ep93xx_rtc->rtc);
b4877d2b	150	goto exit;
fd507e2f AZ	151	}
fd507e2f AZ	152
b4877d2b	153	err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
38f7b009	154	if (err)
5d65cbfb	155	goto exit;
fd507e2f AZ	156
fd507e2f AZ	157	return 0;
38f7b009	158
b4877d2b HS	159	exit:
b4877d2b HS	160	pdev->dev.platform_data = NULL;
38f7b009	161	return err;
fd507e2f AZ	162	}
fd507e2f AZ	163
5a167f45	164	static int ep93xx_rtc_remove(struct platform_device *pdev)
fd507e2f	165	{
b4877d2b	166	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
38f7b009	167	pdev->dev.platform_data = NULL;
fd507e2f	168
fd507e2f AZ	169	return 0;
	170	}
	171
38f7b009	172	static struct platform_driver ep93xx_rtc_driver = {
fd507e2f AZ	173	.driver = {
fd507e2f AZ	174	.name = "ep93xx-rtc",
fd507e2f	175	},
84d56b38	176	.probe = ep93xx_rtc_probe,
5a167f45	177	.remove = ep93xx_rtc_remove,
fd507e2f AZ	178	};
fd507e2f AZ	179
84d56b38	180	module_platform_driver(ep93xx_rtc_driver);
fd507e2f AZ	181
	182	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	183	MODULE_DESCRIPTION("EP93XX RTC driver");
	184	MODULE_LICENSE("GPL");
84d56b38	185	MODULE_ALIAS("platform:ep93xx-rtc");