diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/kernel/timer_broadcast.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/kernel/timer_broadcast.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/timer_broadcast.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/timer_broadcast.c new file mode 100644 index 000000000..8f0cdc4d5 --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/kernel/timer_broadcast.c @@ -0,0 +1,102 @@ +/* + * 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; +} |