tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* rtc-starfire.c: Starfire platform RTC driver.
2 *
3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
4 */
5
6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/time.h>
10#include <linux/rtc.h>
11#include <linux/platform_device.h>
12
13#include <asm/oplib.h>
14
15MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
16MODULE_DESCRIPTION("Starfire RTC driver");
17MODULE_LICENSE("GPL");
18
19struct starfire_rtc {
20 struct rtc_device *rtc;
21 spinlock_t lock;
22};
23
24static u32 starfire_get_time(void)
25{
26 static char obp_gettod[32];
27 static u32 unix_tod;
28
29 sprintf(obp_gettod, "h# %08x unix-gettod",
30 (unsigned int) (long) &unix_tod);
31 prom_feval(obp_gettod);
32
33 return unix_tod;
34}
35
36static int starfire_read_time(struct device *dev, struct rtc_time *tm)
37{
38 struct starfire_rtc *p = dev_get_drvdata(dev);
39 unsigned long flags, secs;
40
41 spin_lock_irqsave(&p->lock, flags);
42 secs = starfire_get_time();
43 spin_unlock_irqrestore(&p->lock, flags);
44
45 rtc_time_to_tm(secs, tm);
46
47 return 0;
48}
49
50static int starfire_set_time(struct device *dev, struct rtc_time *tm)
51{
52 unsigned long secs;
53 int err;
54
55 err = rtc_tm_to_time(tm, &secs);
56 if (err)
57 return err;
58
59 /* Do nothing, time is set using the service processor
60 * console on this platform.
61 */
62 return 0;
63}
64
65static const struct rtc_class_ops starfire_rtc_ops = {
66 .read_time = starfire_read_time,
67 .set_time = starfire_set_time,
68};
69
70static int __devinit starfire_rtc_probe(struct platform_device *pdev)
71{
72 struct starfire_rtc *p = kzalloc(sizeof(*p), GFP_KERNEL);
73
74 if (!p)
75 return -ENOMEM;
76
77 spin_lock_init(&p->lock);
78
79 p->rtc = rtc_device_register("starfire", &pdev->dev,
80 &starfire_rtc_ops, THIS_MODULE);
81 if (IS_ERR(p->rtc)) {
82 int err = PTR_ERR(p->rtc);
83 kfree(p);
84 return err;
85 }
86 platform_set_drvdata(pdev, p);
87 return 0;
88}
89
90static int __devexit starfire_rtc_remove(struct platform_device *pdev)
91{
92 struct starfire_rtc *p = platform_get_drvdata(pdev);
93
94 rtc_device_unregister(p->rtc);
95 kfree(p);
96
97 return 0;
98}
99
100static struct platform_driver starfire_rtc_driver = {
101 .driver = {
102 .name = "rtc-starfire",
103 .owner = THIS_MODULE,
104 },
105 .probe = starfire_rtc_probe,
106 .remove = __devexit_p(starfire_rtc_remove),
107};
108
109static int __init starfire_rtc_init(void)
110{
111 return platform_driver_register(&starfire_rtc_driver);
112}
113
114static void __exit starfire_rtc_exit(void)
115{
116 platform_driver_unregister(&starfire_rtc_driver);
117}
118
119module_init(starfire_rtc_init);
120module_exit(starfire_rtc_exit);