1 files changed, 109 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/kernel/timer_tick.c b/target/linux/ubicom32/files/arch/ubicom32/kernel/timer_tick.c
new file mode 100644
index 000000000..7a2ad4949
--- /dev/null
+++ b/target/linux/ubicom32/files/arch/ubicom32/kernel/timer_tick.c
@@ -0,0 +1,109 @@
+/*
+ * arch/ubicom32/kernel/timer_tick.c
+ *	Impelemets a perodic timer.
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ * Copyright (C) 1991, 1992, 1995  Linus Torvalds
+ *
+ * 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
+ */
+
+#include <linux/profile.h>
+
+#include <asm/ip5000.h>
+#include <asm/machdep.h>
+#if defined(CONFIG_SMP)
+#include <asm/smp.h>
+#endif
+
+static unsigned int timervector;
+static unsigned int frequency;
+
+/*
+ * timer_tick()
+ *	Kernel system timer support. Needs to keep up the real-time clock,
+ * 	as well as call the "do_timer()" routine every clocktick.
+ */
+static irqreturn_t timer_tick(int irq, void *dummy)
+{
+	int ticks;
+
+	BUG_ON(!irqs_disabled());
+	ticks = timer_reset(timervector, frequency);
+
+	write_seqlock(&xtime_lock);
+	do_timer(ticks);
+	write_sequnlock(&xtime_lock);
+
+	update_process_times(user_mode(get_irq_regs()));
+	profile_tick(CPU_PROFILING);
+
+#if defined(CONFIG_SMP)
+	smp_send_timer_all();
+#endif
+	return(IRQ_HANDLED);
+}
+
+/*
+ * Data used by setup_irq for the timer.
+ */
+static struct irqaction timer_irq = {
+	.name	 = "timer",
+	.flags	 = IRQF_DISABLED | IRQF_TIMER,
+	.handler = timer_tick,
+};
+
+/*
+ * timer_tick_init()
+ * 	Implements a periodic timer
+ *
+ * This implementation directly calls the timer_tick() and move
+ * the Linux kernel forward.  This is used when the user has not
+ * selected GENERIC_CLOCKEVENTS.
+ */
+void timer_tick_init(void)
+{
+	/*
+	 * Now allocate a timer to ourselves.
+	 */
+	timervector = timer_alloc();
+	if (timervector == -1) {
+		printk(KERN_WARNING "where did the timer go?\n");
+		return;
+	}
+
+	setup_irq(timervector, &timer_irq);
+
+	/*
+	 * Get the frequency from the processor device tree node or use
+	 * the default if not available. We will store this as the frequency
+	 * of the timer to avoid future calculations.
+	 */
+	frequency = processor_frequency();
+	if (frequency == 0) {
+		frequency = CLOCK_TICK_RATE;
+	}
+	frequency /= CONFIG_HZ;
+
+	printk(KERN_NOTICE "timer will interrupt every: %d cycles\n", frequency);
+	timer_set(timervector, frequency);
+}