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authorPaul Mundt <lethal@linux-sh.org>2008-08-06 18:37:07 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-09-08 10:35:03 +0900
commit8c24594deab89a484879bee270e948f0a556ed75 (patch)
tree2b0c95a4d53614e1118ea20aa7e705d983ddb23f /arch/sh/kernel/timers
parent6f52707e6882eb3bc6920c3f59beb05d23d68354 (diff)
sh: generic clockevent broadcast support.
This hooks up GENERIC_CLOCKEVENTS_BROADCAST and a dummy local timer, which we call in to from the timer IPI when no other local timer is provided. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/timers')
-rw-r--r--arch/sh/kernel/timers/Makefile1
-rw-r--r--arch/sh/kernel/timers/timer-broadcast.c57
2 files changed, 58 insertions, 0 deletions
diff --git a/arch/sh/kernel/timers/Makefile b/arch/sh/kernel/timers/Makefile
index bcf244ff6a12..0b7f8577193f 100644
--- a/arch/sh/kernel/timers/Makefile
+++ b/arch/sh/kernel/timers/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_SH_TMU) += timer-tmu.o
obj-$(CONFIG_SH_MTU2) += timer-mtu2.o
obj-$(CONFIG_SH_CMT) += timer-cmt.o
+obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) += timer-broadcast.o
diff --git a/arch/sh/kernel/timers/timer-broadcast.c b/arch/sh/kernel/timers/timer-broadcast.c
new file mode 100644
index 000000000000..c2317635230f
--- /dev/null
+++ b/arch/sh/kernel/timers/timer-broadcast.c
@@ -0,0 +1,57 @@
+/*
+ * Dummy local timer
+ *
+ * Copyright (C) 2008 Paul Mundt
+ *
+ * cloned from:
+ *
+ * linux/arch/arm/mach-realview/localtimer.c
+ *
+ * Copyright (C) 2002 ARM Ltd.
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#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);
+
+/*
+ * Used on SMP for either the local timer or SMP_MSG_TIMER
+ */
+void local_timer_interrupt(void)
+{
+ struct clock_event_device *clk = &__get_cpu_var(local_clockevent);
+
+ clk->event_handler(clk);
+}
+
+static void dummy_timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *clk)
+{
+}
+
+void __cpuinit local_timer_setup(unsigned int cpu)
+{
+ struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
+
+ clk->name = "dummy_timer";
+ clk->features = CLOCK_EVT_FEAT_DUMMY;
+ clk->rating = 200;
+ clk->mult = 1;
+ clk->set_mode = dummy_timer_set_mode;
+ clk->broadcast = smp_timer_broadcast;
+ clk->cpumask = cpumask_of_cpu(cpu);
+
+ clockevents_register_device(clk);
+}