mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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1a29ef8e97
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19815 3c298f89-4303-0410-b956-a3cf2f4a3e73
103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/*
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* arch/ubicom32/kernel/timer_broadcast.c
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* Implements a dummy clock event for each cpu.
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*
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* Copyright (C) 2008 Paul Mundt
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* (C) Copyright 2009, Ubicom, Inc.
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*
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* This file is part of the Ubicom32 Linux Kernel Port.
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*
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* The Ubicom32 Linux Kernel Port is free software: you can redistribute
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* it and/or modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 2 of the
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* License, or (at your option) any later version.
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*
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* The Ubicom32 Linux Kernel Port is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Ubicom32 Linux Kernel Port. If not,
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* see <http://www.gnu.org/licenses/>.
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*
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* Ubicom32 implementation derived from (with many thanks):
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* arch/m68knommu
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* arch/blackfin
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* arch/parisc
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* arch/arm
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* arch/sh
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/smp.h>
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#include <linux/jiffies.h>
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#include <linux/percpu.h>
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#include <linux/clockchips.h>
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#include <linux/irq.h>
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static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
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/*
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* The broadcast trick only works when the timer will be used in a periodic mode.
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* If the user has configured either NO_HZ or HIGH_RES_TIMERS they must have
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* a per cpu timer.
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*/
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#if defined(CONFIG_NO_HZ) || defined(CONFIG_HIGH_RES_TIMERS)
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#error "Tickless and High Resolution Timers require per-CPU local timers: CONFIG_LOCAL_TIMERS"
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#endif
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/*
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* local_timer_interrupt()
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* Used on SMP for local timer interrupt sent via an IPI.
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*/
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void local_timer_interrupt(void)
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{
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struct clock_event_device *dev = &__get_cpu_var(local_clockevent);
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dev->event_handler(dev);
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}
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/*
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* dummy_timer_set_next_event()
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* Cause the timer to go off "cycles" from now.
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*/
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static int dummy_timer_set_next_event(unsigned long cycles, struct clock_event_device *dev)
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{
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return 0;
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}
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/*
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* dummy_timer_set_mode()
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* Do Nothing.
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*/
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static void dummy_timer_set_mode(enum clock_event_mode mode,
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struct clock_event_device *clk)
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{
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}
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/*
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* local_timer_setup()
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* Adds a clock event for the specified cpu.
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*/
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int __cpuinit local_timer_setup(unsigned int cpu)
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{
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struct clock_event_device *dev = &per_cpu(local_clockevent, cpu);
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dev->name = "timer-dummy";
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dev->features = CLOCK_EVT_FEAT_DUMMY;
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dev->rating = 200;
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dev->mult = 1;
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dev->set_mode = dummy_timer_set_mode;
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dev->set_next_event = dummy_timer_set_next_event;
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dev->broadcast = smp_timer_broadcast;
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dev->cpumask = cpumask_of_cpu(cpu);
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dev->irq = -1;
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printk(KERN_NOTICE "timer[%d]: %s - created\n", dev->irq, dev->name);
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clockevents_register_device(dev);
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return 0;
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}
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