1 /* rtc-starfire.c: Starfire platform RTC driver. 2 * 3 * Author: David S. Miller 4 * License: GPL 5 * 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 16 static 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 28 static 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 34 static const struct rtc_class_ops starfire_rtc_ops = { 35 .read_time = starfire_read_time, 36 }; 37 38 static 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 54 static struct platform_driver starfire_rtc_driver = { 55 .driver = { 56 .name = "rtc-starfire", 57 }, 58 }; 59 60 builtin_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe); 61