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 #ifdef CONFIG_GENERIC_CMOS_UPDATE 42 unsigned long read_persistent_clock(void) 43 { 44 struct timespec tv; 45 rtc_sh_get_time(&tv); 46 return tv.tv_sec; 47 } 48 49 int update_persistent_clock(struct timespec now) 50 { 51 return rtc_sh_set_time(now.tv_sec); 52 } 53 #endif 54 55 unsigned int get_rtc_time(struct rtc_time *tm) 56 { 57 if (rtc_sh_get_time != null_rtc_get_time) { 58 struct timespec tv; 59 60 rtc_sh_get_time(&tv); 61 rtc_time_to_tm(tv.tv_sec, tm); 62 } 63 64 return RTC_24H; 65 } 66 EXPORT_SYMBOL(get_rtc_time); 67 68 int set_rtc_time(struct rtc_time *tm) 69 { 70 unsigned long secs; 71 72 rtc_tm_to_time(tm, &secs); 73 return rtc_sh_set_time(secs); 74 } 75 EXPORT_SYMBOL(set_rtc_time); 76 77 static int __init rtc_generic_init(void) 78 { 79 struct platform_device *pdev; 80 81 if (rtc_sh_get_time == null_rtc_get_time) 82 return -ENODEV; 83 84 pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0); 85 if (IS_ERR(pdev)) 86 return PTR_ERR(pdev); 87 88 return 0; 89 } 90 module_init(rtc_generic_init); 91 92 void (*board_time_init)(void); 93 94 void __init time_init(void) 95 { 96 if (board_time_init) 97 board_time_init(); 98 99 clk_init(); 100 101 rtc_sh_get_time(&xtime); 102 set_normalized_timespec(&wall_to_monotonic, 103 -xtime.tv_sec, -xtime.tv_nsec); 104 105 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 106 local_timer_setup(smp_processor_id()); 107 #endif 108 109 /* 110 * Make sure all compiled-in early timers register themselves. 111 * 112 * Run probe() for two "earlytimer" devices, these will be the 113 * clockevents and clocksource devices respectively. In the event 114 * that only a clockevents device is available, we -ENODEV on the 115 * clocksource and the jiffies clocksource is used transparently 116 * instead. No error handling is necessary here. 117 */ 118 early_platform_driver_register_all("earlytimer"); 119 early_platform_driver_probe("earlytimer", 2, 0); 120 } 121