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
starfire_get_time(void)16 static 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
starfire_read_time(struct device * dev,struct rtc_time * tm)28 static 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
34 static const struct rtc_class_ops starfire_rtc_ops = {
35 .read_time = starfire_read_time,
36 };
37
starfire_rtc_probe(struct platform_device * pdev)38 static 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
54 static struct platform_driver starfire_rtc_driver = {
55 .driver = {
56 .name = "rtc-starfire",
57 },
58 };
59
60 builtin_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe);
61