/* 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);