[GitHub/mt8127/android_kernel_alcatel_ttab.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;
};

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 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 __init ep93xx_rtc_probe(struct platform_device *pdev)
{
	struct ep93xx_rtc *ep93xx_rtc;
	struct resource *res;
	struct rtc_device *rtc;
	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);
	if (!res)
		return -ENXIO;

	if (!devm_request_mem_region(&pdev->dev, res->start,
				     resource_size(res), pdev->name))
		return -EBUSY;

	ep93xx_rtc->mmio_base = devm_ioremap(&pdev->dev, res->start,
					     resource_size(res));
	if (!ep93xx_rtc->mmio_base)
		return -ENXIO;

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

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

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

	return 0;

fail:
	rtc_device_unregister(rtc);
exit:
	platform_set_drvdata(pdev, NULL);
	pdev->dev.platform_data = NULL;
	return err;
}

static int __exit ep93xx_rtc_remove(struct platform_device *pdev)
{
	struct rtc_device *rtc = platform_get_drvdata(pdev);

	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
	platform_set_drvdata(pdev, NULL);
	rtc_device_unregister(rtc);
	pdev->dev.platform_data = 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	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;
	39	};
fd507e2f	40
38f7b009	41	static int ep93xx_rtc_get_swcomp(struct device dev, unsigned short preload,
fd507e2f AZ	42	unsigned short *delete)
fd507e2f AZ	43	{
38f7b009 HS	44	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
	45	unsigned long comp;
	46
	47	comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
fd507e2f AZ	48
fd507e2f AZ	49	if (preload)
38f7b009 HS	50	*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
38f7b009 HS	51	>> EP93XX_RTC_SWCOMP_INT_SHIFT;
fd507e2f AZ	52
fd507e2f AZ	53	if (delete)
38f7b009 HS	54	*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
38f7b009 HS	55	>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
fd507e2f AZ	56
	57	return 0;
	58	}
	59
	60	static int ep93xx_rtc_read_time(struct device dev, struct rtc_time tm)
	61	{
38f7b009 HS	62	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
	63	unsigned long time;
	64
	65	time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
fd507e2f AZ	66
	67	rtc_time_to_tm(time, tm);
	68	return 0;
	69	}
	70
	71	static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs)
	72	{
38f7b009 HS	73	struct ep93xx_rtc *ep93xx_rtc = dev->platform_data;
	74
	75	__raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
fd507e2f AZ	76	return 0;
	77	}
	78
fd507e2f AZ	79	static int ep93xx_rtc_proc(struct device dev, struct seq_file seq)
	80	{
	81	unsigned short preload, delete;
	82
38f7b009	83	ep93xx_rtc_get_swcomp(dev, &preload, &delete);
fd507e2f	84
fd507e2f AZ	85	seq_printf(seq, "preload\t\t: %d\n", preload);
	86	seq_printf(seq, "delete\t\t: %d\n", delete);
	87
	88	return 0;
	89	}
	90
ff8371ac	91	static const struct rtc_class_ops ep93xx_rtc_ops = {
fd507e2f	92	.read_time = ep93xx_rtc_read_time,
fd507e2f AZ	93	.set_mmss = ep93xx_rtc_set_mmss,
	94	.proc = ep93xx_rtc_proc,
	95	};
	96
38f7b009	97	static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev,
fd507e2f AZ	98	struct device_attribute attr, char buf)
	99	{
	100	unsigned short preload;
	101
38f7b009	102	ep93xx_rtc_get_swcomp(dev, &preload, NULL);
fd507e2f AZ	103
	104	return sprintf(buf, "%d\n", preload);
	105	}
38f7b009	106	static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL);
fd507e2f	107
38f7b009	108	static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev,
fd507e2f AZ	109	struct device_attribute attr, char buf)
	110	{
	111	unsigned short delete;
	112
38f7b009	113	ep93xx_rtc_get_swcomp(dev, NULL, &delete);
fd507e2f AZ	114
	115	return sprintf(buf, "%d\n", delete);
	116	}
38f7b009	117	static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL);
fd507e2f	118
b4877d2b HS	119	static struct attribute *ep93xx_rtc_attrs[] = {
	120	&dev_attr_comp_preload.attr,
	121	&dev_attr_comp_delete.attr,
	122	NULL
	123	};
	124
	125	static const struct attribute_group ep93xx_rtc_sysfs_files = {
	126	.attrs = ep93xx_rtc_attrs,
	127	};
fd507e2f	128
38f7b009	129	static int __init ep93xx_rtc_probe(struct platform_device *pdev)
fd507e2f	130	{
38f7b009 HS	131	struct ep93xx_rtc *ep93xx_rtc;
	132	struct resource *res;
	133	struct rtc_device *rtc;
	134	int err;
	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);
b4877d2b HS	141	if (!res)
b4877d2b HS	142	return -ENXIO;
38f7b009	143
b4877d2b HS	144	if (!devm_request_mem_region(&pdev->dev, res->start,
	145	resource_size(res), pdev->name))
	146	return -EBUSY;
38f7b009	147
b4877d2b HS	148	ep93xx_rtc->mmio_base = devm_ioremap(&pdev->dev, res->start,
	149	resource_size(res));
	150	if (!ep93xx_rtc->mmio_base)
	151	return -ENXIO;
fd507e2f	152
38f7b009	153	pdev->dev.platform_data = ep93xx_rtc;
92d921c5	154	platform_set_drvdata(pdev, rtc);
38f7b009 HS	155
	156	rtc = rtc_device_register(pdev->name,
	157	&pdev->dev, &ep93xx_rtc_ops, THIS_MODULE);
fd507e2f	158	if (IS_ERR(rtc)) {
38f7b009	159	err = PTR_ERR(rtc);
b4877d2b	160	goto exit;
fd507e2f AZ	161	}
fd507e2f AZ	162
b4877d2b	163	err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
38f7b009 HS	164	if (err)
38f7b009 HS	165	goto fail;
fd507e2f AZ	166
fd507e2f AZ	167	return 0;
38f7b009 HS	168
38f7b009 HS	169	fail:
b4877d2b HS	170	rtc_device_unregister(rtc);
b4877d2b HS	171	exit:
92d921c5	172	platform_set_drvdata(pdev, NULL);
b4877d2b	173	pdev->dev.platform_data = NULL;
38f7b009	174	return err;
fd507e2f AZ	175	}
fd507e2f AZ	176
38f7b009	177	static int __exit ep93xx_rtc_remove(struct platform_device *pdev)
fd507e2f	178	{
38f7b009	179	struct rtc_device *rtc = platform_get_drvdata(pdev);
38f7b009	180
b4877d2b HS	181	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files);
b4877d2b HS	182	platform_set_drvdata(pdev, NULL);
38f7b009	183	rtc_device_unregister(rtc);
38f7b009	184	pdev->dev.platform_data = NULL;
fd507e2f	185
fd507e2f AZ	186	return 0;
	187	}
	188
ad28a07b KS	189	/* work with hotplug and coldplug */
	190	MODULE_ALIAS("platform:ep93xx-rtc");
	191
38f7b009	192	static struct platform_driver ep93xx_rtc_driver = {
fd507e2f AZ	193	.driver = {
	194	.name = "ep93xx-rtc",
	195	.owner = THIS_MODULE,
	196	},
38f7b009	197	.remove = __exit_p(ep93xx_rtc_remove),
fd507e2f AZ	198	};
	199
	200	static int __init ep93xx_rtc_init(void)
	201	{
38f7b009	202	return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe);
fd507e2f AZ	203	}
	204
	205	static void __exit ep93xx_rtc_exit(void)
	206	{
38f7b009	207	platform_driver_unregister(&ep93xx_rtc_driver);
fd507e2f AZ	208	}
	209
	210	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	211	MODULE_DESCRIPTION("EP93XX RTC driver");
	212	MODULE_LICENSE("GPL");
	213	MODULE_VERSION(DRV_VERSION);
	214
	215	module_init(ep93xx_rtc_init);
	216	module_exit(ep93xx_rtc_exit);