hugetlb: introduce generic version of hugetlb_free_pgd_range
[linux/fpc-iii.git] / arch / m68k / kernel / time.c
blob3a8b47f8f97b820bfa627f79ffbefa268516a2d2
1 /*
2 * linux/arch/m68k/kernel/time.c
4 * Copyright (C) 1991, 1992, 1995 Linus Torvalds
6 * This file contains the m68k-specific time handling details.
7 * Most of the stuff is located in the machine specific files.
9 * 1997-09-10 Updated NTP code according to technical memorandum Jan '96
10 * "A Kernel Model for Precision Timekeeping" by Dave Mills
13 #include <linux/errno.h>
14 #include <linux/export.h>
15 #include <linux/module.h>
16 #include <linux/sched.h>
17 #include <linux/sched/loadavg.h>
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>
25 #include <asm/machdep.h>
26 #include <asm/io.h>
27 #include <asm/irq_regs.h>
29 #include <linux/time.h>
30 #include <linux/timex.h>
31 #include <linux/profile.h>
34 unsigned long (*mach_random_get_entropy)(void);
35 EXPORT_SYMBOL_GPL(mach_random_get_entropy);
39 * timer_interrupt() needs to keep up the real-time clock,
40 * as well as call the "xtime_update()" routine every clocktick
42 static irqreturn_t timer_interrupt(int irq, void *dummy)
44 xtime_update(1);
45 update_process_times(user_mode(get_irq_regs()));
46 profile_tick(CPU_PROFILING);
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;
55 if (cnt == 0 || cnt == dist)
56 mach_heartbeat( 1 );
57 else if (cnt == 7 || cnt == dist+7)
58 mach_heartbeat( 0 );
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;
70 #endif /* CONFIG_HEARTBEAT */
71 return IRQ_HANDLED;
74 #ifdef CONFIG_M68KCLASSIC
75 #if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC)
76 void read_persistent_clock64(struct timespec64 *ts)
78 struct rtc_time time;
80 ts->tv_sec = 0;
81 ts->tv_nsec = 0;
83 if (!mach_hwclk)
84 return;
86 mach_hwclk(0, &time);
88 ts->tv_sec = mktime64(time.tm_year + 1900, time.tm_mon + 1, time.tm_mday,
89 time.tm_hour, time.tm_min, time.tm_sec);
91 #endif
93 #if IS_ENABLED(CONFIG_RTC_DRV_GENERIC)
94 static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
96 mach_hwclk(0, tm);
97 return 0;
100 static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
102 if (mach_hwclk(1, tm) < 0)
103 return -EOPNOTSUPP;
104 return 0;
107 static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
109 struct rtc_pll_info pll;
110 struct rtc_pll_info __user *argp = (void __user *)arg;
112 switch (cmd) {
113 case RTC_PLL_GET:
114 if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll))
115 return -EINVAL;
116 return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
118 case RTC_PLL_SET:
119 if (!mach_set_rtc_pll)
120 return -EINVAL;
121 if (!capable(CAP_SYS_TIME))
122 return -EACCES;
123 if (copy_from_user(&pll, argp, sizeof(pll)))
124 return -EFAULT;
125 return mach_set_rtc_pll(&pll);
128 return -ENOIOCTLCMD;
131 static const struct rtc_class_ops generic_rtc_ops = {
132 .ioctl = rtc_ioctl,
133 .read_time = rtc_generic_get_time,
134 .set_time = rtc_generic_set_time,
137 static int __init rtc_init(void)
139 struct platform_device *pdev;
141 if (!mach_hwclk)
142 return -ENODEV;
144 pdev = platform_device_register_data(NULL, "rtc-generic", -1,
145 &generic_rtc_ops,
146 sizeof(generic_rtc_ops));
147 return PTR_ERR_OR_ZERO(pdev);
150 module_init(rtc_init);
151 #endif /* CONFIG_RTC_DRV_GENERIC */
152 #endif /* CONFIG M68KCLASSIC */
154 void __init time_init(void)
156 mach_sched_init(timer_interrupt);