1 /* 2 * arch/sh/kernel/time.c 3 * 4 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka 5 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> 6 * Copyright (C) 2002 - 2009 Paul Mundt 7 * Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org> 8 * 9 * This file is subject to the terms and conditions of the GNU General Public 10 * License. See the file "COPYING" in the main directory of this archive 11 * for more details. 12 */ 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/profile.h> 17 #include <linux/timex.h> 18 #include <linux/sched.h> 19 #include <linux/clockchips.h> 20 #include <linux/platform_device.h> 21 #include <linux/smp.h> 22 #include <linux/rtc.h> 23 #include <asm/clock.h> 24 #include <asm/rtc.h> 25 26 /* Dummy RTC ops */ 27 static void null_rtc_get_time(struct timespec *tv) 28 { 29 tv->tv_sec = mktime(2000, 1, 1, 0, 0, 0); 30 tv->tv_nsec = 0; 31 } 32 33 static int null_rtc_set_time(const time_t secs) 34 { 35 return 0; 36 } 37 38 void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time; 39 int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time; 40 41 void read_persistent_clock(struct timespec *ts) 42 { 43 rtc_sh_get_time(ts); 44 } 45 46 #ifdef CONFIG_GENERIC_CMOS_UPDATE 47 int update_persistent_clock(struct timespec now) 48 { 49 return rtc_sh_set_time(now.tv_sec); 50 } 51 #endif 52 53 unsigned int get_rtc_time(struct rtc_time *tm) 54 { 55 if (rtc_sh_get_time != null_rtc_get_time) { 56 struct timespec tv; 57 58 rtc_sh_get_time(&tv); 59 rtc_time_to_tm(tv.tv_sec, tm); 60 } 61 62 return RTC_24H; 63 } 64 EXPORT_SYMBOL(get_rtc_time); 65 66 int set_rtc_time(struct rtc_time *tm) 67 { 68 unsigned long secs; 69 70 rtc_tm_to_time(tm, &secs); 71 return rtc_sh_set_time(secs); 72 } 73 EXPORT_SYMBOL(set_rtc_time); 74 75 static int __init rtc_generic_init(void) 76 { 77 struct platform_device *pdev; 78 79 if (rtc_sh_get_time == null_rtc_get_time) 80 return -ENODEV; 81 82 pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0); 83 84 return PTR_ERR_OR_ZERO(pdev); 85 } 86 module_init(rtc_generic_init); 87 88 void (*board_time_init)(void); 89 90 static void __init sh_late_time_init(void) 91 { 92 /* 93 * Make sure all compiled-in early timers register themselves. 94 * 95 * Run probe() for two "earlytimer" devices, these will be the 96 * clockevents and clocksource devices respectively. In the event 97 * that only a clockevents device is available, we -ENODEV on the 98 * clocksource and the jiffies clocksource is used transparently 99 * instead. No error handling is necessary here. 100 */ 101 early_platform_driver_register_all("earlytimer"); 102 early_platform_driver_probe("earlytimer", 2, 0); 103 } 104 105 void __init time_init(void) 106 { 107 if (board_time_init) 108 board_time_init(); 109 110 clk_init(); 111 112 late_time_init = sh_late_time_init; 113 } 114