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/*
* arch/ubicom32/kernel/timer_broadcast.c
* Implements a dummy clock event for each cpu.
*
* Copyright (C) 2008 Paul Mundt
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
* arch/arm
* arch/sh
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/smp.h>
#include <linux/jiffies.h>
#include <linux/percpu.h>
#include <linux/clockchips.h>
#include <linux/irq.h>
static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
/*
* The broadcast trick only works when the timer will be used in a periodic mode.
* If the user has configured either NO_HZ or HIGH_RES_TIMERS they must have
* a per cpu timer.
*/
#if defined(CONFIG_NO_HZ) || defined(CONFIG_HIGH_RES_TIMERS)
#error "Tickless and High Resolution Timers require per-CPU local timers: CONFIG_LOCAL_TIMERS"
#endif
/*
* local_timer_interrupt()
* Used on SMP for local timer interrupt sent via an IPI.
*/
void local_timer_interrupt(void)
{
struct clock_event_device *dev = &__get_cpu_var(local_clockevent);
dev->event_handler(dev);
}
/*
* dummy_timer_set_next_event()
* Cause the timer to go off "cycles" from now.
*/
static int dummy_timer_set_next_event(unsigned long cycles, struct clock_event_device *dev)
{
return 0;
}
/*
* dummy_timer_set_mode()
* Do Nothing.
*/
static void dummy_timer_set_mode(enum clock_event_mode mode,
struct clock_event_device *clk)
{
}
/*
* local_timer_setup()
* Adds a clock event for the specified cpu.
*/
int __cpuinit local_timer_setup(unsigned int cpu)
{
struct clock_event_device *dev = &per_cpu(local_clockevent, cpu);
dev->name = "timer-dummy";
dev->features = CLOCK_EVT_FEAT_DUMMY;
dev->rating = 200;
dev->mult = 1;
dev->set_mode = dummy_timer_set_mode;
dev->set_next_event = dummy_timer_set_next_event;
dev->broadcast = smp_timer_broadcast;
dev->cpumask = cpumask_of_cpu(cpu);
dev->irq = -1;
printk(KERN_NOTICE "timer[%d]: %s - created\n", dev->irq, dev->name);
clockevents_register_device(dev);
return 0;
}
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