rtc-starfire.c 1.16 KB
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/* rtc-starfire.c: Starfire platform RTC driver.
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 *
 * Author: David S. Miller
 * License: GPL
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 *
 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>

#include <asm/oplib.h>

static u32 starfire_get_time(void)
{
	static char obp_gettod[32];
	static u32 unix_tod;

	sprintf(obp_gettod, "h# %08x unix-gettod",
		(unsigned int) (long) &unix_tod);
	prom_feval(obp_gettod);

	return unix_tod;
}

static int starfire_read_time(struct device *dev, struct rtc_time *tm)
{
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	rtc_time_to_tm(starfire_get_time(), tm);
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	return 0;
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}

static const struct rtc_class_ops starfire_rtc_ops = {
	.read_time	= starfire_read_time,
};

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static int __init starfire_rtc_probe(struct platform_device *pdev)
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{
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	struct rtc_device *rtc;

	rtc = devm_rtc_device_register(&pdev->dev, "starfire",
				&starfire_rtc_ops, THIS_MODULE);
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	if (IS_ERR(rtc))
		return PTR_ERR(rtc);
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	platform_set_drvdata(pdev, rtc);
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	return 0;
}

static struct platform_driver starfire_rtc_driver = {
	.driver		= {
		.name	= "rtc-starfire",
	},
};

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builtin_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe);