mirror of
https://github.com/torvalds/linux.git
synced 2024-11-12 07:01:57 +00:00
121 lines
2.4 KiB
C
121 lines
2.4 KiB
C
/* rtc-starfire.c: Starfire platform RTC driver.
|
|
*
|
|
* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/time.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <asm/oplib.h>
|
|
|
|
MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
|
|
MODULE_DESCRIPTION("Starfire RTC driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
struct starfire_rtc {
|
|
struct rtc_device *rtc;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
static u32 starfire_get_time(void)
|
|
{
|
|
static char obp_gettod[32];
|
|
static u32 unix_tod;
|
|
|
|
sprintf(obp_gettod, "h# %08x unix-gettod",
|
|
(unsigned int) (long) &unix_tod);
|
|
prom_feval(obp_gettod);
|
|
|
|
return unix_tod;
|
|
}
|
|
|
|
static int starfire_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct starfire_rtc *p = dev_get_drvdata(dev);
|
|
unsigned long flags, secs;
|
|
|
|
spin_lock_irqsave(&p->lock, flags);
|
|
secs = starfire_get_time();
|
|
spin_unlock_irqrestore(&p->lock, flags);
|
|
|
|
rtc_time_to_tm(secs, tm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int starfire_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
unsigned long secs;
|
|
int err;
|
|
|
|
err = rtc_tm_to_time(tm, &secs);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Do nothing, time is set using the service processor
|
|
* console on this platform.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static const struct rtc_class_ops starfire_rtc_ops = {
|
|
.read_time = starfire_read_time,
|
|
.set_time = starfire_set_time,
|
|
};
|
|
|
|
static int __devinit starfire_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct starfire_rtc *p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&p->lock);
|
|
|
|
p->rtc = rtc_device_register("starfire", &pdev->dev,
|
|
&starfire_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(p->rtc)) {
|
|
int err = PTR_ERR(p->rtc);
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
platform_set_drvdata(pdev, p);
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit starfire_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct starfire_rtc *p = platform_get_drvdata(pdev);
|
|
|
|
rtc_device_unregister(p->rtc);
|
|
kfree(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver starfire_rtc_driver = {
|
|
.driver = {
|
|
.name = "rtc-starfire",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = starfire_rtc_probe,
|
|
.remove = __devexit_p(starfire_rtc_remove),
|
|
};
|
|
|
|
static int __init starfire_rtc_init(void)
|
|
{
|
|
return platform_driver_register(&starfire_rtc_driver);
|
|
}
|
|
|
|
static void __exit starfire_rtc_exit(void)
|
|
{
|
|
platform_driver_unregister(&starfire_rtc_driver);
|
|
}
|
|
|
|
module_init(starfire_rtc_init);
|
|
module_exit(starfire_rtc_exit);
|