[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

#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;
	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_VERSION(DRV_VERSION);
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
	31	#define DRV_VERSION "0.3"
fd507e2f	32
38f7b009 HS	33	/*
	34	* struct device dev.platform_data is used to store our private data
	35	* because struct rtc_device does not have a variable to hold it.
	36	*/
	37	struct ep93xx_rtc {
	38	void __iomem *mmio_base;
bf6ed027	39	struct rtc_device *rtc;
38f7b009	40	};
fd507e2f	41
38f7b009	42	static int ep93xx_rtc_get_swcomp(struct device dev, unsigned short preload,
fd507e2f AZ	43	unsigned short *delete)
fd507e2f AZ	44	{
28dc5f80	45	struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
38f7b009 HS	46	unsigned long comp;
38f7b009 HS	47
ff32ff17	48	comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
fd507e2f AZ	49
fd507e2f AZ	50	if (preload)
38f7b009 HS	51	*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
38f7b009 HS	52	>> EP93XX_RTC_SWCOMP_INT_SHIFT;
fd507e2f AZ	53
fd507e2f AZ	54	if (delete)
38f7b009 HS	55	*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
38f7b009 HS	56	>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
fd507e2f AZ	57
	58	return 0;
	59	}
	60
	61	static int ep93xx_rtc_read_time(struct device dev, struct rtc_time tm)
	62	{
28dc5f80	63	struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
38f7b009 HS	64	unsigned long time;
38f7b009 HS	65
ff32ff17	66	time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
fd507e2f AZ	67
	68	rtc_time_to_tm(time, tm);
	69	return 0;
	70	}
	71
	72	static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
	73	{
28dc5f80	74	struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev);
38f7b009	75
ff32ff17	76	writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
fd507e2f AZ	77	return 0;
	78	}
	79
fd507e2f AZ	80	static int ep93xx_rtc_proc(struct device dev, struct seq_file seq)
	81	{
	82	unsigned short preload, delete;
	83
38f7b009	84	ep93xx_rtc_get_swcomp(dev, &preload, &delete);
fd507e2f	85
fd507e2f AZ	86	seq_printf(seq, "preload\t\t: %d\n", preload);
	87	seq_printf(seq, "delete\t\t: %d\n", delete);
	88
	89	return 0;
	90	}
	91
ff8371ac	92	static const struct rtc_class_ops ep93xx_rtc_ops = {
fd507e2f	93	.read_time = ep93xx_rtc_read_time,
fd507e2f AZ	94	.set_mmss = ep93xx_rtc_set_mmss,
	95	.proc = ep93xx_rtc_proc,
	96	};
	97
38f7b009	98	static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
fd507e2f AZ	99	struct device_attribute attr, char buf)
	100	{
	101	unsigned short preload;
	102
38f7b009	103	ep93xx_rtc_get_swcomp(dev, &preload, NULL);
fd507e2f AZ	104
	105	return sprintf(buf, "%d\n", preload);
	106	}
38f7b009	107	static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
fd507e2f	108
38f7b009	109	static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
fd507e2f AZ	110	struct device_attribute attr, char buf)
	111	{
	112	unsigned short delete;
	113
38f7b009	114	ep93xx_rtc_get_swcomp(dev, NULL, &delete);
fd507e2f AZ	115
	116	return sprintf(buf, "%d\n", delete);
	117	}
38f7b009	118	static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
fd507e2f	119
b4877d2b HS	120	static struct attribute *ep93xx_rtc_attrs[] = {
	121	&dev_attr_comp_preload.attr,
	122	&dev_attr_comp_delete.attr,
	123	NULL
	124	};
	125
	126	static const struct attribute_group ep93xx_rtc_sysfs_files = {
	127	.attrs = ep93xx_rtc_attrs,
	128	};
fd507e2f	129
5a167f45	130	static int ep93xx_rtc_probe(struct platform_device *pdev)
fd507e2f	131	{
38f7b009 HS	132	struct ep93xx_rtc *ep93xx_rtc;
38f7b009 HS	133	struct resource *res;
38f7b009 HS	134	int err;
38f7b009 HS	135
b4877d2b HS	136	ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
b4877d2b HS	137	if (!ep93xx_rtc)
38f7b009 HS	138	return -ENOMEM;
	139
	140	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
7c1d69ee JL	141	ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res);
	142	if (IS_ERR(ep93xx_rtc->mmio_base))
	143	return PTR_ERR(ep93xx_rtc->mmio_base);
fd507e2f	144
38f7b009	145	pdev->dev.platform_data = ep93xx_rtc;
bf6ed027	146	platform_set_drvdata(pdev, ep93xx_rtc);
38f7b009	147
5d65cbfb JH	148	ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev,
5d65cbfb JH	149	pdev->name, &ep93xx_rtc_ops, THIS_MODULE);
bf6ed027 AL	150	if (IS_ERR(ep93xx_rtc->rtc)) {
bf6ed027 AL	151	err = PTR_ERR(ep93xx_rtc->rtc);
b4877d2b	152	goto exit;
fd507e2f AZ	153	}
fd507e2f AZ	154
b4877d2b	155	err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
38f7b009	156	if (err)
5d65cbfb	157	goto exit;
fd507e2f AZ	158
fd507e2f AZ	159	return 0;
38f7b009	160
b4877d2b HS	161	exit:
b4877d2b HS	162	pdev->dev.platform_data = NULL;
38f7b009	163	return err;
fd507e2f AZ	164	}
fd507e2f AZ	165
5a167f45	166	static int ep93xx_rtc_remove(struct platform_device *pdev)
fd507e2f	167	{
b4877d2b	168	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
38f7b009	169	pdev->dev.platform_data = NULL;
fd507e2f	170
fd507e2f AZ	171	return 0;
	172	}
	173
38f7b009	174	static struct platform_driver ep93xx_rtc_driver = {
fd507e2f AZ	175	.driver = {
fd507e2f AZ	176	.name = "ep93xx-rtc",
fd507e2f	177	},
84d56b38	178	.probe = ep93xx_rtc_probe,
5a167f45	179	.remove = ep93xx_rtc_remove,
fd507e2f AZ	180	};
fd507e2f AZ	181
84d56b38	182	module_platform_driver(ep93xx_rtc_driver);
fd507e2f AZ	183
	184	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	185	MODULE_DESCRIPTION("EP93XX RTC driver");
	186	MODULE_LICENSE("GPL");
	187	MODULE_VERSION(DRV_VERSION);
84d56b38	188	MODULE_ALIAS("platform:ep93xx-rtc");