From 8c24594deab89a484879bee270e948f0a556ed75 Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Wed, 6 Aug 2008 18:37:07 +0900 Subject: 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 --- arch/sh/kernel/smp.c | 7 ++-- arch/sh/kernel/time_32.c | 9 ++++-- arch/sh/kernel/timers/Makefile | 1 + arch/sh/kernel/timers/timer-broadcast.c | 57 +++++++++++++++++++++++++++++++++ 4 files changed, 70 insertions(+), 4 deletions(-) create mode 100644 arch/sh/kernel/timers/timer-broadcast.c (limited to 'arch/sh/kernel') diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c index 9cb3734dbd49..c55d314166c7 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 0758b5ee8180..decee0a453ab 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 - * Copyright (C) 2002 - 2007 Paul Mundt + * Copyright (C) 2002 - 2008 Paul Mundt * Copyright (C) 2002 M. R. Brown * * Some code taken from i386 version. @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -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 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 +#include +#include +#include +#include +#include +#include +#include +#include + +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); +} -- cgit v1.2.3