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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
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')
-rw-r--r--arch/sh/Kconfig4
-rw-r--r--arch/sh/include/asm/smp.h3
-rw-r--r--arch/sh/kernel/smp.c7
-rw-r--r--arch/sh/kernel/time_32.c9
-rw-r--r--arch/sh/kernel/timers/Makefile1
-rw-r--r--arch/sh/kernel/timers/timer-broadcast.c57
6 files changed, 77 insertions, 4 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 5131d50f851..399664c1f38 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -66,6 +66,9 @@ config GENERIC_TIME
config GENERIC_CLOCKEVENTS
def_bool n
+config GENERIC_CLOCKEVENTS_BROADCAST
+ bool
+
config GENERIC_LOCKBREAK
def_bool y
depends on SMP && PREEMPT
@@ -323,6 +326,7 @@ config CPU_SUBTYPE_SHX3
select ARCH_SPARSEMEM_ENABLE
select SYS_SUPPORTS_NUMA
select SYS_SUPPORTS_SMP
+ select GENERIC_CLOCKEVENTS_BROADCAST
# SH4AL-DSP Processor Support
diff --git a/arch/sh/include/asm/smp.h b/arch/sh/include/asm/smp.h
index 9d22cda67c2..85b660c17eb 100644
--- a/arch/sh/include/asm/smp.h
+++ b/arch/sh/include/asm/smp.h
@@ -33,6 +33,9 @@ enum {
void smp_message_recv(unsigned int msg);
void smp_timer_broadcast(cpumask_t mask);
+void local_timer_interrupt(void);
+void local_timer_setup(unsigned int cpu);
+
void plat_smp_setup(void);
void plat_prepare_cpus(unsigned int max_cpus);
int plat_smp_processor_id(void);
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index 9cb3734dbd4..c55d314166c 100644
--- a/arch/sh/kernel/smp.c
+++ b/arch/sh/kernel/smp.c
@@ -84,9 +84,12 @@ asmlinkage void __cpuinit start_secondary(void)
local_irq_enable();
+ cpu = smp_processor_id();
+
+ /* Enable local timers */
+ local_timer_setup(cpu);
calibrate_delay();
- cpu = smp_processor_id();
smp_store_cpu_info(cpu);
cpu_set(cpu, cpu_online_map);
@@ -195,7 +198,7 @@ void smp_timer_broadcast(cpumask_t mask)
static void ipi_timer(void)
{
irq_enter();
- /* XXX ... */
+ local_timer_interrupt();
irq_exit();
}
diff --git a/arch/sh/kernel/time_32.c b/arch/sh/kernel/time_32.c
index 0758b5ee818..decee0a453a 100644
--- a/arch/sh/kernel/time_32.c
+++ b/arch/sh/kernel/time_32.c
@@ -1,9 +1,9 @@
/*
- * arch/sh/kernel/time.c
+ * arch/sh/kernel/time_32.c
*
* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
- * Copyright (C) 2002 - 2007 Paul Mundt
+ * Copyright (C) 2002 - 2008 Paul Mundt
* Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org>
*
* Some code taken from i386 version.
@@ -16,6 +16,7 @@
#include <linux/timex.h>
#include <linux/sched.h>
#include <linux/clockchips.h>
+#include <linux/smp.h>
#include <asm/clock.h>
#include <asm/rtc.h>
#include <asm/timer.h>
@@ -260,6 +261,10 @@ void __init time_init(void)
sys_timer = get_sys_timer();
printk(KERN_INFO "Using %s for system timer\n", sys_timer->name);
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+ local_timer_setup(smp_processor_id());
+#endif
+
if (sys_timer->ops->read)
clocksource_sh.read = sys_timer->ops->read;
diff --git a/arch/sh/kernel/timers/Makefile b/arch/sh/kernel/timers/Makefile
index bcf244ff6a1..0b7f8577193 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 00000000000..c2317635230
--- /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);
+}