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1/* rtc-starfire.c: Starfire platform RTC driver.2 *3 * Author: David S. Miller4 * License: GPL5 *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 16static 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 28static 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 34static const struct rtc_class_ops starfire_rtc_ops = {35 .read_time = starfire_read_time,36};37 38static 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 54static struct platform_driver starfire_rtc_driver = {55 .driver = {56 .name = "rtc-starfire",57 },58};59 60builtin_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe);61