[deliverable/linux.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 <mach/hardware.h>

#define EP93XX_RTC_REG(x)	(EP93XX_RTC_BASE + (x))
#define EP93XX_RTC_DATA		EP93XX_RTC_REG(0x0000)
#define EP93XX_RTC_LOAD		EP93XX_RTC_REG(0x000C)
#define EP93XX_RTC_SWCOMP	EP93XX_RTC_REG(0x0108)

#define DRV_VERSION "0.2"

static int ep93xx_get_swcomp(struct device *dev, unsigned short *preload,
				unsigned short *delete)
{
	unsigned short comp = __raw_readl(EP93XX_RTC_SWCOMP);

	if (preload)
		*preload = comp & 0xffff;

	if (delete)
		*delete = (comp >> 16) & 0x1f;

	return 0;
}

static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	unsigned long time = __raw_readl(EP93XX_RTC_DATA);

	rtc_time_to_tm(time, tm);
	return 0;
}

static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
{
	__raw_writel(secs + 1, EP93XX_RTC_LOAD);
	return 0;
}

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

	ep93xx_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_sysfs_show_comp_preload(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	unsigned short preload;

	ep93xx_get_swcomp(dev, &preload, NULL);

	return sprintf(buf, "%d\n", preload);
}
static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL);

static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	unsigned short delete;

	ep93xx_get_swcomp(dev, NULL, &delete);

	return sprintf(buf, "%d\n", delete);
}
static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL);


static int __devinit ep93xx_rtc_probe(struct platform_device *dev)
{
	struct rtc_device *rtc = rtc_device_register("ep93xx",
				&dev->dev, &ep93xx_rtc_ops, THIS_MODULE);

	if (IS_ERR(rtc)) {
		return PTR_ERR(rtc);
	}

	platform_set_drvdata(dev, rtc);

	device_create_file(&dev->dev, &dev_attr_comp_preload);
	device_create_file(&dev->dev, &dev_attr_comp_delete);

	return 0;
}

static int __devexit ep93xx_rtc_remove(struct platform_device *dev)
{
	struct rtc_device *rtc = platform_get_drvdata(dev);

 	if (rtc)
		rtc_device_unregister(rtc);

	platform_set_drvdata(dev, NULL);

	return 0;
}

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

static struct platform_driver ep93xx_rtc_platform_driver = {
	.driver		= {
		.name	= "ep93xx-rtc",
		.owner	= THIS_MODULE,
	},
	.probe		= ep93xx_rtc_probe,
	.remove		= __devexit_p(ep93xx_rtc_remove),
};

static int __init ep93xx_rtc_init(void)
{
	return platform_driver_register(&ep93xx_rtc_platform_driver);
}

static void __exit ep93xx_rtc_exit(void)
{
	platform_driver_unregister(&ep93xx_rtc_platform_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>
a09e64fb	15	#include <mach/hardware.h>
fd507e2f AZ	16
	17	#define EP93XX_RTC_REG(x) (EP93XX_RTC_BASE + (x))
	18	#define EP93XX_RTC_DATA EP93XX_RTC_REG(0x0000)
	19	#define EP93XX_RTC_LOAD EP93XX_RTC_REG(0x000C)
	20	#define EP93XX_RTC_SWCOMP EP93XX_RTC_REG(0x0108)
	21
	22	#define DRV_VERSION "0.2"
	23
	24	static int ep93xx_get_swcomp(struct device dev, unsigned short preload,
	25	unsigned short *delete)
	26	{
	27	unsigned short comp = __raw_readl(EP93XX_RTC_SWCOMP);
	28
	29	if (preload)
	30	*preload = comp & 0xffff;
	31
	32	if (delete)
	33	*delete = (comp >> 16) & 0x1f;
	34
	35	return 0;
	36	}
	37
	38	static int ep93xx_rtc_read_time(struct device dev, struct rtc_time tm)
	39	{
	40	unsigned long time = __raw_readl(EP93XX_RTC_DATA);
	41
	42	rtc_time_to_tm(time, tm);
	43	return 0;
	44	}
	45
	46	static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
	47	{
	48	__raw_writel(secs + 1, EP93XX_RTC_LOAD);
	49	return 0;
	50	}
	51
fd507e2f AZ	52	static int ep93xx_rtc_proc(struct device dev, struct seq_file seq)
	53	{
	54	unsigned short preload, delete;
	55
	56	ep93xx_get_swcomp(dev, &preload, &delete);
	57
fd507e2f AZ	58	seq_printf(seq, "preload\t\t: %d\n", preload);
	59	seq_printf(seq, "delete\t\t: %d\n", delete);
	60
	61	return 0;
	62	}
	63
ff8371ac	64	static const struct rtc_class_ops ep93xx_rtc_ops = {
fd507e2f	65	.read_time = ep93xx_rtc_read_time,
fd507e2f AZ	66	.set_mmss = ep93xx_rtc_set_mmss,
	67	.proc = ep93xx_rtc_proc,
	68	};
	69
	70	static ssize_t ep93xx_sysfs_show_comp_preload(struct device *dev,
	71	struct device_attribute attr, char buf)
	72	{
	73	unsigned short preload;
	74
	75	ep93xx_get_swcomp(dev, &preload, NULL);
	76
	77	return sprintf(buf, "%d\n", preload);
	78	}
	79	static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_sysfs_show_comp_preload, NULL);
	80
	81	static ssize_t ep93xx_sysfs_show_comp_delete(struct device *dev,
	82	struct device_attribute attr, char buf)
	83	{
	84	unsigned short delete;
	85
	86	ep93xx_get_swcomp(dev, NULL, &delete);
	87
	88	return sprintf(buf, "%d\n", delete);
	89	}
	90	static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_sysfs_show_comp_delete, NULL);
	91
	92
	93	static int __devinit ep93xx_rtc_probe(struct platform_device *dev)
	94	{
	95	struct rtc_device *rtc = rtc_device_register("ep93xx",
	96	&dev->dev, &ep93xx_rtc_ops, THIS_MODULE);
	97
	98	if (IS_ERR(rtc)) {
fd507e2f AZ	99	return PTR_ERR(rtc);
	100	}
	101
	102	platform_set_drvdata(dev, rtc);
	103
	104	device_create_file(&dev->dev, &dev_attr_comp_preload);
	105	device_create_file(&dev->dev, &dev_attr_comp_delete);
	106
	107	return 0;
	108	}
	109
	110	static int __devexit ep93xx_rtc_remove(struct platform_device *dev)
	111	{
	112	struct rtc_device *rtc = platform_get_drvdata(dev);
	113
	114	if (rtc)
	115	rtc_device_unregister(rtc);
	116
	117	platform_set_drvdata(dev, NULL);
	118
	119	return 0;
	120	}
	121
ad28a07b KS	122	/* work with hotplug and coldplug */
	123	MODULE_ALIAS("platform:ep93xx-rtc");
	124
fd507e2f AZ	125	static struct platform_driver ep93xx_rtc_platform_driver = {
	126	.driver = {
	127	.name = "ep93xx-rtc",
	128	.owner = THIS_MODULE,
	129	},
	130	.probe = ep93xx_rtc_probe,
	131	.remove = __devexit_p(ep93xx_rtc_remove),
	132	};
	133
	134	static int __init ep93xx_rtc_init(void)
	135	{
	136	return platform_driver_register(&ep93xx_rtc_platform_driver);
	137	}
	138
	139	static void __exit ep93xx_rtc_exit(void)
	140	{
	141	platform_driver_unregister(&ep93xx_rtc_platform_driver);
	142	}
	143
	144	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	145	MODULE_DESCRIPTION("EP93XX RTC driver");
	146	MODULE_LICENSE("GPL");
	147	MODULE_VERSION(DRV_VERSION);
	148
	149	module_init(ep93xx_rtc_init);
	150	module_exit(ep93xx_rtc_exit);