[ubicom32]: move new files out from platform support patch

[openwrt.git] / target / linux / ubicom32 / files / arch / ubicom32 / kernel / timer_broadcast.c

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 (file)
index 0000000..8f0cdc4
--- /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;
+}