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Linux/arch/m68k/kernel/time.c

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  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>
 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>
 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 
 33 
 34 unsigned long (*mach_random_get_entropy)(void);
 35 EXPORT_SYMBOL_GPL(mach_random_get_entropy);
 36 
 37 
 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 
 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 
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 
128 static const struct rtc_class_ops generic_rtc_ops = {
129         .ioctl = rtc_ioctl,
130         .read_time = rtc_generic_get_time,
131         .set_time = rtc_generic_set_time,
132 };
133 
134 static int __init rtc_init(void)
135 {
136         struct platform_device *pdev;
137 
138         if (!mach_hwclk)
139                 return -ENODEV;
140 
141         pdev = platform_device_register_data(NULL, "rtc-generic", -1,
142                                              &generic_rtc_ops,
143                                              sizeof(generic_rtc_ops));
144         return PTR_ERR_OR_ZERO(pdev);
145 }
146 
147 module_init(rtc_init);
148 
149 #endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
150 
151 void __init time_init(void)
152 {
153         mach_sched_init(timer_interrupt);
154 }
155 

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