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Diffstat (limited to 'arch/m68k/kernel/time.c')
| -rw-r--r-- | arch/m68k/kernel/time.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c new file mode 100644 index 000000000..a97600b2a --- /dev/null +++ b/arch/m68k/kernel/time.c @@ -0,0 +1,157 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/arch/m68k/kernel/time.c + * + * Copyright (C) 1991, 1992, 1995 Linus Torvalds + * + * This file contains the m68k-specific time handling details. + * Most of the stuff is located in the machine specific files. + * + * 1997-09-10 Updated NTP code according to technical memorandum Jan '96 + * "A Kernel Model for Precision Timekeeping" by Dave Mills + */ + +#include <linux/errno.h> +#include <linux/export.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/sched/loadavg.h> +#include <linux/kernel.h> +#include <linux/param.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/rtc.h> +#include <linux/platform_device.h> + +#include <asm/machdep.h> +#include <asm/io.h> +#include <asm/irq_regs.h> + +#include <linux/time.h> +#include <linux/timex.h> +#include <linux/profile.h> + + +unsigned long (*mach_random_get_entropy)(void); +EXPORT_SYMBOL_GPL(mach_random_get_entropy); + +#ifdef CONFIG_HEARTBEAT +void timer_heartbeat(void) +{ + /* use power LED as a heartbeat instead -- much more useful + for debugging -- based on the version for PReP by Cort */ + /* acts like an actual heart beat -- ie thump-thump-pause... */ + if (mach_heartbeat) { + static unsigned cnt = 0, period = 0, dist = 0; + + if (cnt == 0 || cnt == dist) + mach_heartbeat( 1 ); + else if (cnt == 7 || cnt == dist+7) + mach_heartbeat( 0 ); + + if (++cnt > period) { + cnt = 0; + /* The hyperbolic function below modifies the heartbeat period + * length in dependency of the current (5min) load. It goes + * through the points f(0)=126, f(1)=86, f(5)=51, + * f(inf)->30. */ + period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30; + dist = period / 4; + } + } +} +#endif /* CONFIG_HEARTBEAT */ + +#ifdef CONFIG_M68KCLASSIC +/* machine dependent timer functions */ +int (*mach_hwclk) (int, struct rtc_time*); +EXPORT_SYMBOL(mach_hwclk); + +int (*mach_get_rtc_pll)(struct rtc_pll_info *); +int (*mach_set_rtc_pll)(struct rtc_pll_info *); +EXPORT_SYMBOL(mach_get_rtc_pll); +EXPORT_SYMBOL(mach_set_rtc_pll); + +#if !IS_BUILTIN(CONFIG_RTC_DRV_GENERIC) +void read_persistent_clock64(struct timespec64 *ts) +{ + struct rtc_time time; + + ts->tv_sec = 0; + ts->tv_nsec = 0; + + if (!mach_hwclk) + return; + + mach_hwclk(0, &time); + + ts->tv_sec = mktime64(time.tm_year + 1900, time.tm_mon + 1, time.tm_mday, + time.tm_hour, time.tm_min, time.tm_sec); +} +#endif + +#if IS_ENABLED(CONFIG_RTC_DRV_GENERIC) +static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm) +{ + mach_hwclk(0, tm); + return 0; +} + +static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm) +{ + if (mach_hwclk(1, tm) < 0) + return -EOPNOTSUPP; + return 0; +} + +static int rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) +{ + struct rtc_pll_info pll; + struct rtc_pll_info __user *argp = (void __user *)arg; + + switch (cmd) { + case RTC_PLL_GET: + if (!mach_get_rtc_pll || mach_get_rtc_pll(&pll)) + return -EINVAL; + return copy_to_user(argp, &pll, sizeof pll) ? -EFAULT : 0; + + case RTC_PLL_SET: + if (!mach_set_rtc_pll) + return -EINVAL; + if (!capable(CAP_SYS_TIME)) + return -EACCES; + if (copy_from_user(&pll, argp, sizeof(pll))) + return -EFAULT; + return mach_set_rtc_pll(&pll); + } + + return -ENOIOCTLCMD; +} + +static const struct rtc_class_ops generic_rtc_ops = { + .ioctl = rtc_ioctl, + .read_time = rtc_generic_get_time, + .set_time = rtc_generic_set_time, +}; + +static int __init rtc_init(void) +{ + struct platform_device *pdev; + + if (!mach_hwclk) + return -ENODEV; + + pdev = platform_device_register_data(NULL, "rtc-generic", -1, + &generic_rtc_ops, + sizeof(generic_rtc_ops)); + return PTR_ERR_OR_ZERO(pdev); +} + +module_init(rtc_init); +#endif /* CONFIG_RTC_DRV_GENERIC */ +#endif /* CONFIG M68KCLASSIC */ + +void __init time_init(void) +{ + mach_sched_init(); +} |