1/* rtc-starfire.c: Starfire platform RTC driver.
2 *
3 * Author: David S. Miller
4 * License: GPL
5 *
6 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/rtc.h>
12#include <linux/platform_device.h>
13
14#include <asm/oplib.h>
15
16static u32 starfire_get_time(void)
17{
18	static char obp_gettod[32];
19	static u32 unix_tod;
20
21	sprintf(obp_gettod, "h# %08x unix-gettod",
22		(unsigned int) (long) &unix_tod);
23	prom_feval(obp_gettod);
24
25	return unix_tod;
26}
27
28static int starfire_read_time(struct device *dev, struct rtc_time *tm)
29{
30	rtc_time64_to_tm(starfire_get_time(), tm);
31	return 0;
32}
33
34static const struct rtc_class_ops starfire_rtc_ops = {
35	.read_time	= starfire_read_time,
36};
37
38static int __init starfire_rtc_probe(struct platform_device *pdev)
39{
40	struct rtc_device *rtc;
41
42	rtc = devm_rtc_allocate_device(&pdev->dev);
43	if (IS_ERR(rtc))
44		return PTR_ERR(rtc);
45
46	rtc->ops = &starfire_rtc_ops;
47	rtc->range_max = U32_MAX;
48
49	platform_set_drvdata(pdev, rtc);
50
51	return devm_rtc_register_device(rtc);
52}
53
54static struct platform_driver starfire_rtc_driver = {
55	.driver		= {
56		.name	= "rtc-starfire",
57	},
58};
59
60builtin_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe);
61