Release 4.12 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

/*
 * 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;
}

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Alessandro Zummo
49
62.03%
1
25.00%
H Hartley Sweeten
27
34.18%
2
50.00%
Jingoo Han
3
3.80%
1
25.00%
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79
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4
100.00%



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;
}

Contributors
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Alessandro Zummo
32
62.75%
1
25.00%
H Hartley Sweeten
16
31.37%
2
50.00%
Jingoo Han
3
5.88%
1
25.00%
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51
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4
100.00%



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;
}

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Alessandro Zummo
26
63.41%
1
25.00%
H Hartley Sweeten
12
29.27%
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Jingoo Han
3
7.32%
1
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41
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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;
}

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Alessandro Zummo
53
98.15%
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1.85%
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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);
}
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Alessandro Zummo
42
95.45%
1
50.00%
H Hartley Sweeten
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4.55%
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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);
}
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Alessandro Zummo
42
95.45%
1
50.00%
H Hartley Sweeten
2
4.55%
1
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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;
}

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H Hartley Sweeten
121
63.68%
2
28.57%
Alessandro Zummo
41
21.58%
1
14.29%
Julia Lawall
10
5.26%
1
14.29%
Axel Lin
7
3.68%
1
14.29%
Wolfram Sang
6
3.16%
1
14.29%
Jingoo Han
5
2.63%
1
14.29%
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190
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7
100.00%



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;
}

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Alessandro Zummo
14
40.00%
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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_ALIAS("platform:ep93xx-rtc");
Overall Contributors
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Alessandro Zummo
407
54.19%
1
8.33%
H Hartley Sweeten
298
39.68%
4
33.33%
Jingoo Han
14
1.86%
2
16.67%
Axel Lin
12
1.60%
1
8.33%
Julia Lawall
10
1.33%
1
8.33%
Wolfram Sang
6
0.80%
1
8.33%
Tejun Heo
3
0.40%
1
8.33%
David Brownell
1
0.13%
1
8.33%
Total
751
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12
100.00%
Directory: drivers/rtc

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