^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/arch/m68k/kernel/time.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1991, 1992, 1995 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * This file contains the m68k-specific time handling details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Most of the stuff is located in the machine specific files.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * 1997-09-10 Updated NTP code according to technical memorandum Jan '96
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * "A Kernel Model for Precision Timekeeping" by Dave Mills
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/sched/loadavg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/param.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/rtc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <asm/machdep.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <asm/irq_regs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/timex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/profile.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) unsigned long (*mach_random_get_entropy)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) EXPORT_SYMBOL_GPL(mach_random_get_entropy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * timer_interrupt() needs to keep up the real-time clock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * as well as call the "xtime_update()" routine every clocktick
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static irqreturn_t timer_interrupt(int irq, void *dummy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) xtime_update(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) update_process_times(user_mode(get_irq_regs()));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) profile_tick(CPU_PROFILING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #ifdef CONFIG_HEARTBEAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /* use power LED as a heartbeat instead -- much more useful
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) for debugging -- based on the version for PReP by Cort */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) /* acts like an actual heart beat -- ie thump-thump-pause... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (mach_heartbeat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static unsigned cnt = 0, period = 0, dist = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (cnt == 0 || cnt == dist)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) mach_heartbeat( 1 );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) else if (cnt == 7 || cnt == dist+7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) mach_heartbeat( 0 );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (++cnt > period) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /* The hyperbolic function below modifies the heartbeat period
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * length in dependency of the current (5min) load. It goes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * through the points f(0)=126, f(1)=86, f(5)=51,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * f(inf)->30. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) dist = period / 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #endif /* CONFIG_HEARTBEAT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #ifdef CONFIG_M68KCLASSIC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) void read_persistent_clock64(struct timespec64 *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct rtc_time time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) ts->tv_sec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ts->tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (!mach_hwclk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) mach_hwclk(0, &time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) ts->tv_sec = mktime64(time.tm_year + 1900, time.tm_mon + 1, time.tm_mday,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) time.tm_hour, time.tm_min, time.tm_sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #if IS_ENABLED(CONFIG_RTC_DRV_GENERIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) mach_hwclk(0, tm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (mach_hwclk(1, tm) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct rtc_pll_info pll;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct rtc_pll_info __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) case RTC_PLL_GET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) case RTC_PLL_SET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (!mach_set_rtc_pll)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (!capable(CAP_SYS_TIME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (copy_from_user(&pll, argp, sizeof(pll)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return mach_set_rtc_pll(&pll);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static const struct rtc_class_ops generic_rtc_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) .ioctl = rtc_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .read_time = rtc_generic_get_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .set_time = rtc_generic_set_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int __init rtc_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct platform_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (!mach_hwclk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) pdev = platform_device_register_data(NULL, "rtc-generic", -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) &generic_rtc_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) sizeof(generic_rtc_ops));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return PTR_ERR_OR_ZERO(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) module_init(rtc_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) #endif /* CONFIG_RTC_DRV_GENERIC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) #endif /* CONFIG M68KCLASSIC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) void __init time_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) mach_sched_init(timer_interrupt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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