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 | |
16 | static u32 starfire_get_time(void) |
17 | { |
18 | static char obp_gettod[32]; |
19 | static u32 unix_tod; |
20 | |
21 | sprintf(buf: obp_gettod, fmt: "h# %08x unix-gettod", |
22 | (unsigned int) (long) &unix_tod); |
23 | prom_feval(obp_gettod); |
24 | |
25 | return unix_tod; |
26 | } |
27 | |
28 | static int starfire_read_time(struct device *dev, struct rtc_time *tm) |
29 | { |
30 | rtc_time64_to_tm(time: 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 | |
38 | static int __init starfire_rtc_probe(struct platform_device *pdev) |
39 | { |
40 | struct rtc_device *rtc; |
41 | |
42 | rtc = devm_rtc_allocate_device(dev: &pdev->dev); |
43 | if (IS_ERR(ptr: rtc)) |
44 | return PTR_ERR(ptr: rtc); |
45 | |
46 | rtc->ops = &starfire_rtc_ops; |
47 | rtc->range_max = U32_MAX; |
48 | |
49 | platform_set_drvdata(pdev, data: 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 |