[linux-2.6-block.git] / drivers / rtc / rtc-ep93xx.c

// SPDX-License-Identifier: GPL-2.0
/*
 * A driver for the RTC embedded in the Cirrus Logic EP93XX processors
 * Copyright (c) 2006 Tower Technologies
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 */

#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		 BIT(0)
#define EP93XX_RTC_LOAD			0x00C
#define EP93XX_RTC_CONTROL		0x010
#define  EP93XX_RTC_CONTROL_MIE		 BIT(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_drvdata(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_drvdata(dev);
	unsigned long time;

	time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);

	rtc_time64_to_tm(time, tm);
	return 0;
}

static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
	unsigned long secs = rtc_tm_to_time64(tm);

	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_time	= ep93xx_rtc_set_time,
	.proc		= ep93xx_rtc_proc,
};

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

	ep93xx_rtc_get_swcomp(dev->parent, &preload, NULL);

	return sprintf(buf, "%d\n", preload);
}
static DEVICE_ATTR_RO(comp_preload);

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

	ep93xx_rtc_get_swcomp(dev->parent, NULL, &delete);

	return sprintf(buf, "%d\n", delete);
}
static DEVICE_ATTR_RO(comp_delete);

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;
	int err;

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

	ep93xx_rtc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
	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_allocate_device(&pdev->dev);
	if (IS_ERR(ep93xx_rtc->rtc))
		return PTR_ERR(ep93xx_rtc->rtc);

	ep93xx_rtc->rtc->ops = &ep93xx_rtc_ops;
	ep93xx_rtc->rtc->range_max = U32_MAX;

	err = rtc_add_group(ep93xx_rtc->rtc, &ep93xx_rtc_sysfs_files);
	if (err)
		return err;

	return devm_rtc_register_device(ep93xx_rtc->rtc);
}

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

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
4fdf4d23	1	// SPDX-License-Identifier: GPL-2.0
fd507e2f AZ	2	/*
	3	* A driver for the RTC embedded in the Cirrus Logic EP93XX processors
	4	* Copyright (c) 2006 Tower Technologies
	5	*
	6	* Author: Alessandro Zummo <a.zummo@towertech.it>
fd507e2f AZ	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/rtc.h>
	11	#include <linux/platform_device.h>
38f7b009	12	#include <linux/io.h>
5a0e3ad6	13	#include <linux/gfp.h>
38f7b009 HS	14
	15	#define EP93XX_RTC_DATA 0x000
	16	#define EP93XX_RTC_MATCH 0x004
	17	#define EP93XX_RTC_STATUS 0x008
d71c7715	18	#define EP93XX_RTC_STATUS_INTR BIT(0)
38f7b009 HS	19	#define EP93XX_RTC_LOAD 0x00C
38f7b009 HS	20	#define EP93XX_RTC_CONTROL 0x010
d71c7715	21	#define EP93XX_RTC_CONTROL_MIE BIT(0)
38f7b009 HS	22	#define EP93XX_RTC_SWCOMP 0x108
	23	#define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000
	24	#define EP93XX_RTC_SWCOMP_DEL_SHIFT 16
	25	#define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff
	26	#define EP93XX_RTC_SWCOMP_INT_SHIFT 0
	27
38f7b009 HS	28	struct ep93xx_rtc {
38f7b009 HS	29	void __iomem *mmio_base;
bf6ed027	30	struct rtc_device *rtc;
38f7b009	31	};
fd507e2f	32
38f7b009	33	static int ep93xx_rtc_get_swcomp(struct device dev, unsigned short preload,
d71c7715	34	unsigned short *delete)
fd507e2f	35	{
00c33482	36	struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
38f7b009 HS	37	unsigned long comp;
38f7b009 HS	38
ff32ff17	39	comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
fd507e2f AZ	40
fd507e2f AZ	41	if (preload)
38f7b009 HS	42	*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
38f7b009 HS	43	>> EP93XX_RTC_SWCOMP_INT_SHIFT;
fd507e2f AZ	44
fd507e2f AZ	45	if (delete)
38f7b009 HS	46	*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
38f7b009 HS	47	>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
fd507e2f AZ	48
	49	return 0;
	50	}
	51
	52	static int ep93xx_rtc_read_time(struct device dev, struct rtc_time tm)
	53	{
00c33482	54	struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
38f7b009 HS	55	unsigned long time;
38f7b009 HS	56
725412d9	57	time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
fd507e2f	58
886a77e7	59	rtc_time64_to_tm(time, tm);
fd507e2f AZ	60	return 0;
	61	}
	62
ef9440a2	63	static int ep93xx_rtc_set_time(struct device dev, struct rtc_time tm)
fd507e2f	64	{
00c33482	65	struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
ef9440a2	66	unsigned long secs = rtc_tm_to_time64(tm);
38f7b009	67
ff32ff17	68	writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
fd507e2f AZ	69	return 0;
	70	}
	71
fd507e2f AZ	72	static int ep93xx_rtc_proc(struct device dev, struct seq_file seq)
	73	{
	74	unsigned short preload, delete;
	75
38f7b009	76	ep93xx_rtc_get_swcomp(dev, &preload, &delete);
fd507e2f	77
fd507e2f AZ	78	seq_printf(seq, "preload\t\t: %d\n", preload);
	79	seq_printf(seq, "delete\t\t: %d\n", delete);
	80
	81	return 0;
	82	}
	83
ff8371ac	84	static const struct rtc_class_ops ep93xx_rtc_ops = {
fd507e2f	85	.read_time = ep93xx_rtc_read_time,
ef9440a2	86	.set_time = ep93xx_rtc_set_time,
fd507e2f AZ	87	.proc = ep93xx_rtc_proc,
	88	};
	89
d71c7715 AB	90	static ssize_t comp_preload_show(struct device *dev,
d71c7715 AB	91	struct device_attribute attr, char buf)
fd507e2f AZ	92	{
	93	unsigned short preload;
	94
09cd030b	95	ep93xx_rtc_get_swcomp(dev->parent, &preload, NULL);
fd507e2f AZ	96
	97	return sprintf(buf, "%d\n", preload);
	98	}
d71c7715	99	static DEVICE_ATTR_RO(comp_preload);
fd507e2f	100
d71c7715 AB	101	static ssize_t comp_delete_show(struct device *dev,
d71c7715 AB	102	struct device_attribute attr, char buf)
fd507e2f AZ	103	{
	104	unsigned short delete;
	105
09cd030b	106	ep93xx_rtc_get_swcomp(dev->parent, NULL, &delete);
fd507e2f AZ	107
	108	return sprintf(buf, "%d\n", delete);
	109	}
d71c7715	110	static DEVICE_ATTR_RO(comp_delete);
fd507e2f	111
b4877d2b HS	112	static struct attribute *ep93xx_rtc_attrs[] = {
	113	&dev_attr_comp_preload.attr,
	114	&dev_attr_comp_delete.attr,
	115	NULL
	116	};
	117
	118	static const struct attribute_group ep93xx_rtc_sysfs_files = {
	119	.attrs = ep93xx_rtc_attrs,
	120	};
fd507e2f	121
5a167f45	122	static int ep93xx_rtc_probe(struct platform_device *pdev)
fd507e2f	123	{
38f7b009	124	struct ep93xx_rtc *ep93xx_rtc;
38f7b009 HS	125	int err;
38f7b009 HS	126
b4877d2b HS	127	ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
b4877d2b HS	128	if (!ep93xx_rtc)
38f7b009 HS	129	return -ENOMEM;
38f7b009 HS	130
09ef18bc	131	ep93xx_rtc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
7c1d69ee JL	132	if (IS_ERR(ep93xx_rtc->mmio_base))
7c1d69ee JL	133	return PTR_ERR(ep93xx_rtc->mmio_base);
fd507e2f	134
bf6ed027	135	platform_set_drvdata(pdev, ep93xx_rtc);
38f7b009	136
bac68b30	137	ep93xx_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
b809d192 AB	138	if (IS_ERR(ep93xx_rtc->rtc))
b809d192 AB	139	return PTR_ERR(ep93xx_rtc->rtc);
fd507e2f	140
bac68b30	141	ep93xx_rtc->rtc->ops = &ep93xx_rtc_ops;
2d4fc6df	142	ep93xx_rtc->rtc->range_max = U32_MAX;
bac68b30	143
09cd030b	144	err = rtc_add_group(ep93xx_rtc->rtc, &ep93xx_rtc_sysfs_files);
bac68b30 AB	145	if (err)
	146	return err;
	147
fdcfd854	148	return devm_rtc_register_device(ep93xx_rtc->rtc);
fd507e2f AZ	149	}
fd507e2f AZ	150
38f7b009	151	static struct platform_driver ep93xx_rtc_driver = {
fd507e2f AZ	152	.driver = {
fd507e2f AZ	153	.name = "ep93xx-rtc",
fd507e2f	154	},
84d56b38	155	.probe = ep93xx_rtc_probe,
fd507e2f AZ	156	};
fd507e2f AZ	157
84d56b38	158	module_platform_driver(ep93xx_rtc_driver);
fd507e2f AZ	159
	160	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	161	MODULE_DESCRIPTION("EP93XX RTC driver");
	162	MODULE_LICENSE("GPL");
84d56b38	163	MODULE_ALIAS("platform:ep93xx-rtc");