[linux-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/mod_devicetable.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 const struct of_device_id ep93xx_rtc_of_ids[] = {
	{ .compatible = "cirrus,ep9301-rtc" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ep93xx_rtc_of_ids);

static struct platform_driver ep93xx_rtc_driver = {
	.driver		= {
		.name	= "ep93xx-rtc",
		.of_match_table = ep93xx_rtc_of_ids,
	},
	.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>
1d70f9fe	10	#include <linux/mod_devicetable.h>
fd507e2f AZ	11	#include <linux/rtc.h>
fd507e2f AZ	12	#include <linux/platform_device.h>
38f7b009	13	#include <linux/io.h>
5a0e3ad6	14	#include <linux/gfp.h>
38f7b009 HS	15
	16	#define EP93XX_RTC_DATA 0x000
	17	#define EP93XX_RTC_MATCH 0x004
	18	#define EP93XX_RTC_STATUS 0x008
d71c7715	19	#define EP93XX_RTC_STATUS_INTR BIT(0)
38f7b009 HS	20	#define EP93XX_RTC_LOAD 0x00C
38f7b009 HS	21	#define EP93XX_RTC_CONTROL 0x010
d71c7715	22	#define EP93XX_RTC_CONTROL_MIE BIT(0)
38f7b009 HS	23	#define EP93XX_RTC_SWCOMP 0x108
	24	#define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000
	25	#define EP93XX_RTC_SWCOMP_DEL_SHIFT 16
	26	#define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff
	27	#define EP93XX_RTC_SWCOMP_INT_SHIFT 0
	28
38f7b009 HS	29	struct ep93xx_rtc {
38f7b009 HS	30	void __iomem *mmio_base;
bf6ed027	31	struct rtc_device *rtc;
38f7b009	32	};
fd507e2f	33
38f7b009	34	static int ep93xx_rtc_get_swcomp(struct device dev, unsigned short preload,
d71c7715	35	unsigned short *delete)
fd507e2f	36	{
00c33482	37	struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
38f7b009 HS	38	unsigned long comp;
38f7b009 HS	39
ff32ff17	40	comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
fd507e2f AZ	41
fd507e2f AZ	42	if (preload)
38f7b009 HS	43	*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
38f7b009 HS	44	>> EP93XX_RTC_SWCOMP_INT_SHIFT;
fd507e2f AZ	45
fd507e2f AZ	46	if (delete)
38f7b009 HS	47	*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
38f7b009 HS	48	>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
fd507e2f AZ	49
	50	return 0;
	51	}
	52
	53	static int ep93xx_rtc_read_time(struct device dev, struct rtc_time tm)
	54	{
00c33482	55	struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
38f7b009 HS	56	unsigned long time;
38f7b009 HS	57
725412d9	58	time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
fd507e2f	59
886a77e7	60	rtc_time64_to_tm(time, tm);
fd507e2f AZ	61	return 0;
	62	}
	63
ef9440a2	64	static int ep93xx_rtc_set_time(struct device dev, struct rtc_time tm)
fd507e2f	65	{
00c33482	66	struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
ef9440a2	67	unsigned long secs = rtc_tm_to_time64(tm);
38f7b009	68
ff32ff17	69	writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
fd507e2f AZ	70	return 0;
	71	}
	72
fd507e2f AZ	73	static int ep93xx_rtc_proc(struct device dev, struct seq_file seq)
	74	{
	75	unsigned short preload, delete;
	76
38f7b009	77	ep93xx_rtc_get_swcomp(dev, &preload, &delete);
fd507e2f	78
fd507e2f AZ	79	seq_printf(seq, "preload\t\t: %d\n", preload);
	80	seq_printf(seq, "delete\t\t: %d\n", delete);
	81
	82	return 0;
	83	}
	84
ff8371ac	85	static const struct rtc_class_ops ep93xx_rtc_ops = {
fd507e2f	86	.read_time = ep93xx_rtc_read_time,
ef9440a2	87	.set_time = ep93xx_rtc_set_time,
fd507e2f AZ	88	.proc = ep93xx_rtc_proc,
	89	};
	90
d71c7715 AB	91	static ssize_t comp_preload_show(struct device *dev,
d71c7715 AB	92	struct device_attribute attr, char buf)
fd507e2f AZ	93	{
	94	unsigned short preload;
	95
09cd030b	96	ep93xx_rtc_get_swcomp(dev->parent, &preload, NULL);
fd507e2f AZ	97
	98	return sprintf(buf, "%d\n", preload);
	99	}
d71c7715	100	static DEVICE_ATTR_RO(comp_preload);
fd507e2f	101
d71c7715 AB	102	static ssize_t comp_delete_show(struct device *dev,
d71c7715 AB	103	struct device_attribute attr, char buf)
fd507e2f AZ	104	{
	105	unsigned short delete;
	106
09cd030b	107	ep93xx_rtc_get_swcomp(dev->parent, NULL, &delete);
fd507e2f AZ	108
	109	return sprintf(buf, "%d\n", delete);
	110	}
d71c7715	111	static DEVICE_ATTR_RO(comp_delete);
fd507e2f	112
b4877d2b HS	113	static struct attribute *ep93xx_rtc_attrs[] = {
	114	&dev_attr_comp_preload.attr,
	115	&dev_attr_comp_delete.attr,
	116	NULL
	117	};
	118
	119	static const struct attribute_group ep93xx_rtc_sysfs_files = {
	120	.attrs = ep93xx_rtc_attrs,
	121	};
fd507e2f	122
5a167f45	123	static int ep93xx_rtc_probe(struct platform_device *pdev)
fd507e2f	124	{
38f7b009	125	struct ep93xx_rtc *ep93xx_rtc;
38f7b009 HS	126	int err;
38f7b009 HS	127
b4877d2b HS	128	ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
b4877d2b HS	129	if (!ep93xx_rtc)
38f7b009 HS	130	return -ENOMEM;
38f7b009 HS	131
09ef18bc	132	ep93xx_rtc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
7c1d69ee JL	133	if (IS_ERR(ep93xx_rtc->mmio_base))
7c1d69ee JL	134	return PTR_ERR(ep93xx_rtc->mmio_base);
fd507e2f	135
bf6ed027	136	platform_set_drvdata(pdev, ep93xx_rtc);
38f7b009	137
bac68b30	138	ep93xx_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
b809d192 AB	139	if (IS_ERR(ep93xx_rtc->rtc))
b809d192 AB	140	return PTR_ERR(ep93xx_rtc->rtc);
fd507e2f	141
bac68b30	142	ep93xx_rtc->rtc->ops = &ep93xx_rtc_ops;
2d4fc6df	143	ep93xx_rtc->rtc->range_max = U32_MAX;
bac68b30	144
09cd030b	145	err = rtc_add_group(ep93xx_rtc->rtc, &ep93xx_rtc_sysfs_files);
bac68b30 AB	146	if (err)
	147	return err;
	148
fdcfd854	149	return devm_rtc_register_device(ep93xx_rtc->rtc);
fd507e2f AZ	150	}
fd507e2f AZ	151
1d70f9fe NS	152	static const struct of_device_id ep93xx_rtc_of_ids[] = {
	153	{ .compatible = "cirrus,ep9301-rtc" },
	154	{ /* sentinel */ }
	155	};
	156	MODULE_DEVICE_TABLE(of, ep93xx_rtc_of_ids);
	157
38f7b009	158	static struct platform_driver ep93xx_rtc_driver = {
fd507e2f AZ	159	.driver = {
fd507e2f AZ	160	.name = "ep93xx-rtc",
1d70f9fe	161	.of_match_table = ep93xx_rtc_of_ids,
fd507e2f	162	},
84d56b38	163	.probe = ep93xx_rtc_probe,
fd507e2f AZ	164	};
fd507e2f AZ	165
84d56b38	166	module_platform_driver(ep93xx_rtc_driver);
fd507e2f AZ	167
	168	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	169	MODULE_DESCRIPTION("EP93XX RTC driver");
	170	MODULE_LICENSE("GPL");
84d56b38	171	MODULE_ALIAS("platform:ep93xx-rtc");