/* * Based on arch/arm/kernel/time.c * * Copyright (C) 1991, 1992, 1995  Linus Torvalds * Modifications for ARM (C) 1994-2001 Russell King * Copyright (C) 2012 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program.  If not, see <http://www.gnu.org/licenses/>. */ #include <linux/clockchips.h>#include <linux/export.h>#include <linux/kernel.h>#include <linux/interrupt.h>#include <linux/time.h>#include <linux/init.h>#include <linux/sched.h>#include <linux/smp.h>#include <linux/timex.h>#include <linux/errno.h>#include <linux/profile.h>#include <linux/syscore_ops.h>#include <linux/timer.h>#include <linux/irq.h>#include <linux/delay.h>#include <linux/clocksource.h>#include <linux/clk-provider.h>#include <linux/acpi.h> #include <clocksource/arm_arch_timer.h> #include <asm/thread_info.h>#include <asm/stacktrace.h> unsigned long profile_pc(struct pt_regs *regs){	struct stackframe frame; 	if (!in_lock_functions(regs->pc))		return regs->pc; 	frame.fp = regs->regs[29];	frame.sp = regs->sp;	frame.pc = regs->pc;#ifdef CONFIG_FUNCTION_GRAPH_TRACER	frame.graph = -1; /* no task info */#endif	do {		int ret = unwind_frame(NULL, &frame);		if (ret < 0)			return 0;	} while (in_lock_functions(frame.pc)); 	return frame.pc;}EXPORT_SYMBOL(profile_pc); void __init time_init(void){	u32 arch_timer_rate; 	of_clk_init(NULL);	timer_probe(); 	tick_setup_hrtimer_broadcast(); 	arch_timer_rate = arch_timer_get_rate();	if (!arch_timer_rate)		panic("Unable to initialise architected timer.\n"); 	/* Calibrate the delay loop directly */	lpj_fine = arch_timer_rate / HZ;}