[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 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);

	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))
		return PTR_ERR(ep93xx_rtc->rtc);

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

	return 0;
}

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

	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	struct ep93xx_rtc {
38f7b009 HS	32	void __iomem *mmio_base;
bf6ed027	33	struct rtc_device *rtc;
38f7b009	34	};
fd507e2f	35
38f7b009	36	static int ep93xx_rtc_get_swcomp(struct device dev, unsigned short preload,
fd507e2f AZ	37	unsigned short *delete)
fd507e2f AZ	38	{
28dc5f80	39	struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
38f7b009 HS	40	unsigned long comp;
38f7b009 HS	41
ff32ff17	42	comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
fd507e2f AZ	43
fd507e2f AZ	44	if (preload)
38f7b009 HS	45	*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
38f7b009 HS	46	>> EP93XX_RTC_SWCOMP_INT_SHIFT;
fd507e2f AZ	47
fd507e2f AZ	48	if (delete)
38f7b009 HS	49	*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
38f7b009 HS	50	>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
fd507e2f AZ	51
	52	return 0;
	53	}
	54
	55	static int ep93xx_rtc_read_time(struct device dev, struct rtc_time tm)
	56	{
28dc5f80	57	struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
38f7b009 HS	58	unsigned long time;
38f7b009 HS	59
725412d9	60	time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
fd507e2f AZ	61
	62	rtc_time_to_tm(time, tm);
	63	return 0;
	64	}
	65
	66	static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
	67	{
28dc5f80	68	struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
38f7b009	69
ff32ff17	70	writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
fd507e2f AZ	71	return 0;
	72	}
	73
fd507e2f AZ	74	static int ep93xx_rtc_proc(struct device dev, struct seq_file seq)
	75	{
	76	unsigned short preload, delete;
	77
38f7b009	78	ep93xx_rtc_get_swcomp(dev, &preload, &delete);
fd507e2f	79
fd507e2f AZ	80	seq_printf(seq, "preload\t\t: %d\n", preload);
	81	seq_printf(seq, "delete\t\t: %d\n", delete);
	82
	83	return 0;
	84	}
	85
ff8371ac	86	static const struct rtc_class_ops ep93xx_rtc_ops = {
fd507e2f	87	.read_time = ep93xx_rtc_read_time,
fd507e2f AZ	88	.set_mmss = ep93xx_rtc_set_mmss,
	89	.proc = ep93xx_rtc_proc,
	90	};
	91
38f7b009	92	static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
fd507e2f AZ	93	struct device_attribute attr, char buf)
	94	{
	95	unsigned short preload;
	96
38f7b009	97	ep93xx_rtc_get_swcomp(dev, &preload, NULL);
fd507e2f AZ	98
	99	return sprintf(buf, "%d\n", preload);
	100	}
38f7b009	101	static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
fd507e2f	102
38f7b009	103	static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
fd507e2f AZ	104	struct device_attribute attr, char buf)
	105	{
	106	unsigned short delete;
	107
38f7b009	108	ep93xx_rtc_get_swcomp(dev, NULL, &delete);
fd507e2f AZ	109
	110	return sprintf(buf, "%d\n", delete);
	111	}
38f7b009	112	static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
fd507e2f	113
b4877d2b HS	114	static struct attribute *ep93xx_rtc_attrs[] = {
	115	&dev_attr_comp_preload.attr,
	116	&dev_attr_comp_delete.attr,
	117	NULL
	118	};
	119
	120	static const struct attribute_group ep93xx_rtc_sysfs_files = {
	121	.attrs = ep93xx_rtc_attrs,
	122	};
fd507e2f	123
5a167f45	124	static int ep93xx_rtc_probe(struct platform_device *pdev)
fd507e2f	125	{
38f7b009 HS	126	struct ep93xx_rtc *ep93xx_rtc;
38f7b009 HS	127	struct resource *res;
38f7b009 HS	128	int err;
38f7b009 HS	129
b4877d2b HS	130	ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
b4877d2b HS	131	if (!ep93xx_rtc)
38f7b009 HS	132	return -ENOMEM;
	133
	134	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
7c1d69ee JL	135	ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res);
	136	if (IS_ERR(ep93xx_rtc->mmio_base))
	137	return PTR_ERR(ep93xx_rtc->mmio_base);
fd507e2f	138
bf6ed027	139	platform_set_drvdata(pdev, ep93xx_rtc);
38f7b009	140
5d65cbfb JH	141	ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev,
5d65cbfb JH	142	pdev->name, &ep93xx_rtc_ops, THIS_MODULE);
b809d192 AB	143	if (IS_ERR(ep93xx_rtc->rtc))
b809d192 AB	144	return PTR_ERR(ep93xx_rtc->rtc);
fd507e2f	145
b4877d2b	146	err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
38f7b009	147	if (err)
b809d192	148	return err;
fd507e2f AZ	149
	150	return 0;
	151	}
	152
5a167f45	153	static int ep93xx_rtc_remove(struct platform_device *pdev)
fd507e2f	154	{
b4877d2b	155	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
fd507e2f	156
fd507e2f AZ	157	return 0;
	158	}
	159
38f7b009	160	static struct platform_driver ep93xx_rtc_driver = {
fd507e2f AZ	161	.driver = {
fd507e2f AZ	162	.name = "ep93xx-rtc",
fd507e2f	163	},
84d56b38	164	.probe = ep93xx_rtc_probe,
5a167f45	165	.remove = ep93xx_rtc_remove,
fd507e2f AZ	166	};
fd507e2f AZ	167
84d56b38	168	module_platform_driver(ep93xx_rtc_driver);
fd507e2f AZ	169
	170	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	171	MODULE_DESCRIPTION("EP93XX RTC driver");
	172	MODULE_LICENSE("GPL");
84d56b38	173	MODULE_ALIAS("platform:ep93xx-rtc");