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99 lines
2.2 KiB
99 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/arch/arm/kernel/time.c |
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* |
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* Copyright (C) 1991, 1992, 1995 Linus Torvalds |
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* Modifications for ARM (C) 1994-2001 Russell King |
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* |
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* This file contains the ARM-specific time handling details: |
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* reading the RTC at bootup, etc... |
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*/ |
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#include <linux/clockchips.h> |
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#include <linux/clocksource.h> |
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#include <linux/errno.h> |
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#include <linux/export.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/kernel.h> |
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#include <linux/of_clk.h> |
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#include <linux/profile.h> |
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#include <linux/sched.h> |
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#include <linux/sched_clock.h> |
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#include <linux/smp.h> |
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#include <linux/time.h> |
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#include <linux/timex.h> |
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#include <linux/timer.h> |
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#include <asm/mach/arch.h> |
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#include <asm/mach/time.h> |
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#include <asm/stacktrace.h> |
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#include <asm/thread_info.h> |
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#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || \ |
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defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) |
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/* this needs a better home */ |
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DEFINE_SPINLOCK(rtc_lock); |
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EXPORT_SYMBOL(rtc_lock); |
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#endif /* pc-style 'CMOS' RTC support */ |
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/* change this if you have some constant time drift */ |
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#define USECS_PER_JIFFY (1000000/HZ) |
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#ifdef CONFIG_SMP |
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unsigned long profile_pc(struct pt_regs *regs) |
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{ |
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struct stackframe frame; |
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if (!in_lock_functions(regs->ARM_pc)) |
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return regs->ARM_pc; |
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arm_get_current_stackframe(regs, &frame); |
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do { |
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int ret = unwind_frame(&frame); |
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if (ret < 0) |
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return 0; |
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} while (in_lock_functions(frame.pc)); |
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return frame.pc; |
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} |
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EXPORT_SYMBOL(profile_pc); |
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#endif |
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static void dummy_clock_access(struct timespec64 *ts) |
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{ |
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ts->tv_sec = 0; |
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ts->tv_nsec = 0; |
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} |
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static clock_access_fn __read_persistent_clock = dummy_clock_access; |
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void read_persistent_clock64(struct timespec64 *ts) |
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{ |
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__read_persistent_clock(ts); |
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} |
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int __init register_persistent_clock(clock_access_fn read_persistent) |
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{ |
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/* Only allow the clockaccess functions to be registered once */ |
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if (__read_persistent_clock == dummy_clock_access) { |
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if (read_persistent) |
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__read_persistent_clock = read_persistent; |
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return 0; |
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} |
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return -EINVAL; |
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} |
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void __init time_init(void) |
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{ |
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if (machine_desc->init_time) { |
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machine_desc->init_time(); |
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} else { |
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#ifdef CONFIG_COMMON_CLK |
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of_clk_init(NULL); |
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#endif |
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timer_probe(); |
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tick_setup_hrtimer_broadcast(); |
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} |
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}
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