/*
|
* 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.pc = regs->pc;
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
frame.graph = current->curr_ret_stack;
|
#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;
|
}
|
