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/* 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);
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