Greg Ungerer | fa7f9e7 | 2012-01-23 16:23:33 +1000 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m68k/kernel/time.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds |
| 5 | * |
| 6 | * This file contains the m68k-specific time handling details. |
| 7 | * Most of the stuff is located in the machine specific files. |
| 8 | * |
| 9 | * 1997-09-10 Updated NTP code according to technical memorandum Jan '96 |
| 10 | * "A Kernel Model for Precision Timekeeping" by Dave Mills |
| 11 | */ |
| 12 | |
| 13 | #include <linux/errno.h> |
Geert Uytterhoeven | 5bc8c7c | 2014-07-10 18:03:17 +0200 | [diff] [blame] | 14 | #include <linux/export.h> |
Greg Ungerer | fa7f9e7 | 2012-01-23 16:23:33 +1000 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | #include <linux/sched.h> |
Ingo Molnar | badaff8 | 2017-02-08 08:45:17 +0100 | [diff] [blame] | 17 | #include <linux/sched/loadavg.h> |
Greg Ungerer | fa7f9e7 | 2012-01-23 16:23:33 +1000 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/param.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/rtc.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | |
| 25 | #include <asm/machdep.h> |
| 26 | #include <asm/io.h> |
| 27 | #include <asm/irq_regs.h> |
| 28 | |
| 29 | #include <linux/time.h> |
| 30 | #include <linux/timex.h> |
| 31 | #include <linux/profile.h> |
| 32 | |
Geert Uytterhoeven | 017cece | 2013-10-18 13:10:08 +0200 | [diff] [blame] | 33 | |
| 34 | unsigned long (*mach_random_get_entropy)(void); |
Geert Uytterhoeven | 5bc8c7c | 2014-07-10 18:03:17 +0200 | [diff] [blame] | 35 | EXPORT_SYMBOL_GPL(mach_random_get_entropy); |
Geert Uytterhoeven | 017cece | 2013-10-18 13:10:08 +0200 | [diff] [blame] | 36 | |
| 37 | |
Greg Ungerer | fa7f9e7 | 2012-01-23 16:23:33 +1000 | [diff] [blame] | 38 | /* |
| 39 | * timer_interrupt() needs to keep up the real-time clock, |
| 40 | * as well as call the "xtime_update()" routine every clocktick |
| 41 | */ |
| 42 | static irqreturn_t timer_interrupt(int irq, void *dummy) |
| 43 | { |
| 44 | xtime_update(1); |
| 45 | update_process_times(user_mode(get_irq_regs())); |
| 46 | profile_tick(CPU_PROFILING); |
| 47 | |
| 48 | #ifdef CONFIG_HEARTBEAT |
| 49 | /* use power LED as a heartbeat instead -- much more useful |
| 50 | for debugging -- based on the version for PReP by Cort */ |
| 51 | /* acts like an actual heart beat -- ie thump-thump-pause... */ |
| 52 | if (mach_heartbeat) { |
| 53 | static unsigned cnt = 0, period = 0, dist = 0; |
| 54 | |
| 55 | if (cnt == 0 || cnt == dist) |
| 56 | mach_heartbeat( 1 ); |
| 57 | else if (cnt == 7 || cnt == dist+7) |
| 58 | mach_heartbeat( 0 ); |
| 59 | |
| 60 | if (++cnt > period) { |
| 61 | cnt = 0; |
| 62 | /* The hyperbolic function below modifies the heartbeat period |
| 63 | * length in dependency of the current (5min) load. It goes |
| 64 | * through the points f(0)=126, f(1)=86, f(5)=51, |
| 65 | * f(inf)->30. */ |
| 66 | period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30; |
| 67 | dist = period / 4; |
| 68 | } |
| 69 | } |
| 70 | #endif /* CONFIG_HEARTBEAT */ |
| 71 | return IRQ_HANDLED; |
| 72 | } |
| 73 | |
| 74 | void read_persistent_clock(struct timespec *ts) |
| 75 | { |
| 76 | struct rtc_time time; |
| 77 | ts->tv_sec = 0; |
| 78 | ts->tv_nsec = 0; |
| 79 | |
| 80 | if (mach_hwclk) { |
| 81 | mach_hwclk(0, &time); |
| 82 | |
| 83 | if ((time.tm_year += 1900) < 1970) |
| 84 | time.tm_year += 100; |
| 85 | ts->tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday, |
| 86 | time.tm_hour, time.tm_min, time.tm_sec); |
| 87 | } |
| 88 | } |
| 89 | |
Arnd Bergmann | 923c904 | 2016-05-30 20:57:57 +0200 | [diff] [blame] | 90 | #if defined(CONFIG_ARCH_USES_GETTIMEOFFSET) && IS_ENABLED(CONFIG_RTC_DRV_GENERIC) |
| 91 | static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm) |
| 92 | { |
| 93 | mach_hwclk(0, tm); |
| 94 | return rtc_valid_tm(tm); |
| 95 | } |
| 96 | |
| 97 | static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm) |
| 98 | { |
| 99 | if (mach_hwclk(1, tm) < 0) |
| 100 | return -EOPNOTSUPP; |
| 101 | return 0; |
| 102 | } |
| 103 | |
Arnd Bergmann | 598e8a1 | 2016-05-30 20:57:58 +0200 | [diff] [blame] | 104 | static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
| 105 | { |
| 106 | struct rtc_pll_info pll; |
| 107 | struct rtc_pll_info __user *argp = (void __user *)arg; |
| 108 | |
| 109 | switch (cmd) { |
| 110 | case RTC_PLL_GET: |
| 111 | if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll)) |
| 112 | return -EINVAL; |
| 113 | return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0; |
| 114 | |
| 115 | case RTC_PLL_SET: |
| 116 | if (!mach_set_rtc_pll) |
| 117 | return -EINVAL; |
| 118 | if (!capable(CAP_SYS_TIME)) |
| 119 | return -EACCES; |
| 120 | if (copy_from_user(&pll, argp, sizeof(pll))) |
| 121 | return -EFAULT; |
| 122 | return mach_set_rtc_pll(&pll); |
| 123 | } |
| 124 | |
| 125 | return -ENOIOCTLCMD; |
| 126 | } |
| 127 | |
Arnd Bergmann | 923c904 | 2016-05-30 20:57:57 +0200 | [diff] [blame] | 128 | static const struct rtc_class_ops generic_rtc_ops = { |
Arnd Bergmann | 598e8a1 | 2016-05-30 20:57:58 +0200 | [diff] [blame] | 129 | .ioctl = rtc_ioctl, |
Arnd Bergmann | 923c904 | 2016-05-30 20:57:57 +0200 | [diff] [blame] | 130 | .read_time = rtc_generic_get_time, |
| 131 | .set_time = rtc_generic_set_time, |
| 132 | }; |
Greg Ungerer | fa7f9e7 | 2012-01-23 16:23:33 +1000 | [diff] [blame] | 133 | |
Greg Ungerer | fa7f9e7 | 2012-01-23 16:23:33 +1000 | [diff] [blame] | 134 | static int __init rtc_init(void) |
| 135 | { |
| 136 | struct platform_device *pdev; |
| 137 | |
| 138 | if (!mach_hwclk) |
| 139 | return -ENODEV; |
| 140 | |
Arnd Bergmann | 923c904 | 2016-05-30 20:57:57 +0200 | [diff] [blame] | 141 | pdev = platform_device_register_data(NULL, "rtc-generic", -1, |
| 142 | &generic_rtc_ops, |
| 143 | sizeof(generic_rtc_ops)); |
Rusty Russell | 8c6ffba | 2013-07-15 11:20:32 +0930 | [diff] [blame] | 144 | return PTR_ERR_OR_ZERO(pdev); |
Greg Ungerer | fa7f9e7 | 2012-01-23 16:23:33 +1000 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | module_init(rtc_init); |
| 148 | |
Greg Ungerer | b13b3f5 | 2012-05-23 11:32:45 +1000 | [diff] [blame] | 149 | #endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */ |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 150 | |
| 151 | void __init time_init(void) |
| 152 | { |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 153 | mach_sched_init(timer_interrupt); |
| 154 | } |