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/hwblk.h> 25 #include <asm/rtc.h> 26 27 /* Dummy RTC ops */ 28 static void null_rtc_get_time(struct timespec *tv) 29 { 30 tv->tv_sec = mktime(2000, 1, 1, 0, 0, 0); 31 tv->tv_nsec = 0; 32 } 33 34 static int null_rtc_set_time(const time_t secs) 35 { 36 return 0; 37 } 38 39 void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time; 40 int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time; 41 42 void read_persistent_clock(struct timespec *ts) 43 { 44 rtc_sh_get_time(ts); 45 } 46 47 #ifdef CONFIG_GENERIC_CMOS_UPDATE 48 int update_persistent_clock(struct timespec now) 49 { 50 return rtc_sh_set_time(now.tv_sec); 51 } 52 #endif 53 54 unsigned int get_rtc_time(struct rtc_time *tm) 55 { 56 if (rtc_sh_get_time != null_rtc_get_time) { 57 struct timespec tv; 58 59 rtc_sh_get_time(&tv); 60 rtc_time_to_tm(tv.tv_sec, tm); 61 } 62 63 return RTC_24H; 64 } 65 EXPORT_SYMBOL(get_rtc_time); 66 67 int set_rtc_time(struct rtc_time *tm) 68 { 69 unsigned long secs; 70 71 rtc_tm_to_time(tm, &secs); 72 return rtc_sh_set_time(secs); 73 } 74 EXPORT_SYMBOL(set_rtc_time); 75 76 static int __init rtc_generic_init(void) 77 { 78 struct platform_device *pdev; 79 80 if (rtc_sh_get_time == null_rtc_get_time) 81 return -ENODEV; 82 83 pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0); 84 if (IS_ERR(pdev)) 85 return PTR_ERR(pdev); 86 87 return 0; 88 } 89 module_init(rtc_generic_init); 90 91 void (*board_time_init)(void); 92 93 static void __init sh_late_time_init(void) 94 { 95 /* 96 * Make sure all compiled-in early timers register themselves. 97 * 98 * Run probe() for two "earlytimer" devices, these will be the 99 * clockevents and clocksource devices respectively. In the event 100 * that only a clockevents device is available, we -ENODEV on the 101 * clocksource and the jiffies clocksource is used transparently 102 * instead. No error handling is necessary here. 103 */ 104 early_platform_driver_register_all("earlytimer"); 105 early_platform_driver_probe("earlytimer", 2, 0); 106 } 107 108 void __init time_init(void) 109 { 110 if (board_time_init) 111 board_time_init(); 112 113 hwblk_init(); 114 clk_init(); 115 116 late_time_init = sh_late_time_init; 117 } 118