/* * 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 <clocksource/arm_arch_timer.h> #include <asm/thread_info.h> #include <asm/stacktrace.h> #ifdef CONFIG_SMP 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; do { int ret = unwind_frame(&frame); if (ret < 0) return 0; } while (in_lock_functions(frame.pc)); return frame.pc; } EXPORT_SYMBOL(profile_pc); #endif void __init time_init(void) { u32 arch_timer_rate; of_clk_init(NULL); clocksource_of_init(); 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; }