ARM: smp: Remove local timer API

There are no more users of this API, remove it.

Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

3 files changed, 0 insertions, 113 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 374a1d8900ec..46fa88091631 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1544,16 +1544,6 @@ config ARM_PSCI
           0022A ("Power State Coordination Interface System Software on
           ARM processors").
 
-config LOCAL_TIMERS
-        bool "Use local timer interrupts"
-        depends on SMP
-        default y
-        help
-          Enable support for local timers on SMP platforms, rather then the
-          legacy IPI broadcast method.  Local timers allows the system
-          accounting to be spread across the timer interval, preventing a
-          "thundering herd" at every timer tick.
-
 # The GPIO number here must be sorted by descending number. In case of
 # a multiplatform kernel, we just want the highest value required by the
 # selected platforms.
diff --git a/arch/arm/include/asm/localtimer.h b/arch/arm/include/asm/localtimer.h
deleted file mode 100644
index f77ffc1eb0c2..000000000000
--- a/arch/arm/include/asm/localtimer.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- *  arch/arm/include/asm/localtimer.h
- *
- *  Copyright (C) 2004-2005 ARM Ltd.
- *
- * 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.
- */
-#ifndef __ASM_ARM_LOCALTIMER_H
-#define __ASM_ARM_LOCALTIMER_H
-
-#include <linux/errno.h>
-
-struct clock_event_device;
-
-struct local_timer_ops {
-        int  (*setup)(struct clock_event_device *);
-        void (*stop)(struct clock_event_device *);
-};
-
-#ifdef CONFIG_LOCAL_TIMERS
-/*
- * Register a local timer driver
- */
-int local_timer_register(struct local_timer_ops *);
-#else
-static inline int local_timer_register(struct local_timer_ops *ops)
-{
-        return -ENXIO;
-}
-#endif
-
-#endif
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 4dc883a77adc..54aa994c4b20 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -41,7 +41,6 @@
 #include <asm/sections.h>
 #include <asm/tlbflush.h>
 #include <asm/ptrace.h>
-#include <asm/localtimer.h>
 #include <asm/smp_plat.h>
 #include <asm/virt.h>
 #include <asm/mach/arch.h>
@@ -133,8 +132,6 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-static void percpu_timer_stop(void);
-
 static int platform_cpu_kill(unsigned int cpu)
 {
         if (smp_ops.cpu_kill)
@@ -178,11 +175,6 @@ int __cpuinit __cpu_disable(void)
         migrate_irqs();
 
         /*
-         * Stop the local timer for this CPU.
-         */
-        percpu_timer_stop();
-
-        /*
          * Flush user cache and TLB mappings, and then remove this CPU
          * from the vm mask set of all processes.
          *
@@ -303,8 +295,6 @@ static void __cpuinit smp_store_cpu_info(unsigned int cpuid)
         store_cpu_topology(cpuid);
 }
 
-static void percpu_timer_setup(void);
-
 /*
  * This is the secondary CPU boot entry.  We're using this CPUs
  * idle thread stack, but a set of temporary page tables.
@@ -359,11 +349,6 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
         set_cpu_online(cpu, true);
         complete(&cpu_running);
 
-        /*
-         * Setup the percpu timer for this CPU.
-         */
-        percpu_timer_setup();
-
         local_irq_enable();
         local_fiq_enable();
 
@@ -410,12 +395,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
                 max_cpus = ncores;
         if (ncores > 1 && max_cpus) {
                 /*
-                 * Enable the local timer or broadcast device for the
-                 * boot CPU, but only if we have more than one CPU.
-                 */
-                percpu_timer_setup();
-
-                /*
                  * Initialise the present map, which describes the set of CPUs
                  * actually populated at the present time. A platform should
                  * re-initialize the map in the platforms smp_prepare_cpus()
@@ -491,11 +470,6 @@ u64 smp_irq_stat_cpu(unsigned int cpu)
         return sum;
 }
 
-/*
- * Timer (local or broadcast) support
- */
-static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent);
-
 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 void tick_broadcast(const struct cpumask *mask)
 {
@@ -503,49 +477,6 @@ void tick_broadcast(const struct cpumask *mask)
 }
 #endif
 
-static struct local_timer_ops *lt_ops;
-
-#ifdef CONFIG_LOCAL_TIMERS
-int local_timer_register(struct local_timer_ops *ops)
-{
-        if (!is_smp() || !setup_max_cpus)
-                return -ENXIO;
-
-        if (lt_ops)
-                return -EBUSY;
-
-        lt_ops = ops;
-        return 0;
-}
-#endif
-
-static void __cpuinit percpu_timer_setup(void)
-{
-        unsigned int cpu = smp_processor_id();
-        struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
-
-        evt->cpumask = cpumask_of(cpu);
-
-        if (lt_ops)
-                lt_ops->setup(evt);
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-/*
- * The generic clock events code purposely does not stop the local timer
- * on CPU_DEAD/CPU_DEAD_FROZEN hotplug events, so we have to do it
- * manually here.
- */
-static void percpu_timer_stop(void)
-{
-        unsigned int cpu = smp_processor_id();
-        struct clock_event_device *evt = &per_cpu(percpu_clockevent, cpu);
-
-        if (lt_ops)
-                lt_ops->stop(evt);
-}
-#endif
-
 static DEFINE_RAW_SPINLOCK(stop_lock);
 
 /*