reset: starfive: Factor out common JH71X0 reset code
[platform/kernel/linux-starfive.git] / drivers / rtc / rtc-starfire.c
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(obp_gettod, "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(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(&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);