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Linux/arch/m68k/kernel/time.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  linux/arch/m68k/kernel/time.c
  4  *
  5  *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
  6  *
  7  * This file contains the m68k-specific time handling details.
  8  * Most of the stuff is located in the machine specific files.
  9  *
 10  * 1997-09-10   Updated NTP code according to technical memorandum Jan '96
 11  *              "A Kernel Model for Precision Timekeeping" by Dave Mills
 12  */
 13 
 14 #include <linux/errno.h>
 15 #include <linux/export.h>
 16 #include <linux/module.h>
 17 #include <linux/sched.h>
 18 #include <linux/sched/loadavg.h>
 19 #include <linux/kernel.h>
 20 #include <linux/param.h>
 21 #include <linux/string.h>
 22 #include <linux/mm.h>
 23 #include <linux/rtc.h>
 24 #include <linux/platform_device.h>
 25 
 26 #include <asm/machdep.h>
 27 #include <asm/io.h>
 28 #include <asm/irq_regs.h>
 29 
 30 #include <linux/time.h>
 31 #include <linux/timex.h>
 32 #include <linux/profile.h>
 33 
 34 
 35 unsigned long (*mach_random_get_entropy)(void);
 36 EXPORT_SYMBOL_GPL(mach_random_get_entropy);
 37 
 38 
 39 /*
 40  * timer_interrupt() needs to keep up the real-time clock,
 41  * as well as call the "xtime_update()" routine every clocktick
 42  */
 43 static irqreturn_t timer_interrupt(int irq, void *dummy)
 44 {
 45         xtime_update(1);
 46         update_process_times(user_mode(get_irq_regs()));
 47         profile_tick(CPU_PROFILING);
 48 
 49 #ifdef CONFIG_HEARTBEAT
 50         /* use power LED as a heartbeat instead -- much more useful
 51            for debugging -- based on the version for PReP by Cort */
 52         /* acts like an actual heart beat -- ie thump-thump-pause... */
 53         if (mach_heartbeat) {
 54             static unsigned cnt = 0, period = 0, dist = 0;
 55 
 56             if (cnt == 0 || cnt == dist)
 57                 mach_heartbeat( 1 );
 58             else if (cnt == 7 || cnt == dist+7)
 59                 mach_heartbeat( 0 );
 60 
 61             if (++cnt > period) {
 62                 cnt = 0;
 63                 /* The hyperbolic function below modifies the heartbeat period
 64                  * length in dependency of the current (5min) load. It goes
 65                  * through the points f(0)=126, f(1)=86, f(5)=51,
 66                  * f(inf)->30. */
 67                 period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
 68                 dist = period / 4;
 69             }
 70         }
 71 #endif /* CONFIG_HEARTBEAT */
 72         return IRQ_HANDLED;
 73 }
 74 
 75 #ifdef CONFIG_M68KCLASSIC
 76 #if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC)
 77 void read_persistent_clock64(struct timespec64 *ts)
 78 {
 79         struct rtc_time time;
 80 
 81         ts->tv_sec = 0;
 82         ts->tv_nsec = 0;
 83 
 84         if (!mach_hwclk)
 85                 return;
 86 
 87         mach_hwclk(0, &time);
 88 
 89         ts->tv_sec = mktime64(time.tm_year + 1900, time.tm_mon + 1, time.tm_mday,
 90                               time.tm_hour, time.tm_min, time.tm_sec);
 91 }
 92 #endif
 93 
 94 #if IS_ENABLED(CONFIG_RTC_DRV_GENERIC)
 95 static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
 96 {
 97         mach_hwclk(0, tm);
 98         return 0;
 99 }
100 
101 static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
102 {
103         if (mach_hwclk(1, tm) < 0)
104                 return -EOPNOTSUPP;
105         return 0;
106 }
107 
108 static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
109 {
110         struct rtc_pll_info pll;
111         struct rtc_pll_info __user *argp = (void __user *)arg;
112 
113         switch (cmd) {
114         case RTC_PLL_GET:
115                 if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll))
116                         return -EINVAL;
117                 return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
118 
119         case RTC_PLL_SET:
120                 if (!mach_set_rtc_pll)
121                         return -EINVAL;
122                 if (!capable(CAP_SYS_TIME))
123                         return -EACCES;
124                 if (copy_from_user(&pll, argp, sizeof(pll)))
125                         return -EFAULT;
126                 return mach_set_rtc_pll(&pll);
127         }
128 
129         return -ENOIOCTLCMD;
130 }
131 
132 static const struct rtc_class_ops generic_rtc_ops = {
133         .ioctl = rtc_ioctl,
134         .read_time = rtc_generic_get_time,
135         .set_time = rtc_generic_set_time,
136 };
137 
138 static int __init rtc_init(void)
139 {
140         struct platform_device *pdev;
141 
142         if (!mach_hwclk)
143                 return -ENODEV;
144 
145         pdev = platform_device_register_data(NULL, "rtc-generic", -1,
146                                              &generic_rtc_ops,
147                                              sizeof(generic_rtc_ops));
148         return PTR_ERR_OR_ZERO(pdev);
149 }
150 
151 module_init(rtc_init);
152 #endif /* CONFIG_RTC_DRV_GENERIC */
153 #endif /* CONFIG M68KCLASSIC */
154 
155 void __init time_init(void)
156 {
157         mach_sched_init(timer_interrupt);
158 }
159 

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