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Commit bc28248e authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] smp: move core localtimer support out of platform specific files 



Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent ee348d5a

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -859,6 +859,7 @@ source "kernel/time/Kconfig" 
config SMP

	bool "Symmetric Multi-Processing (EXPERIMENTAL)"

	depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)

	depends on GENERIC_CLOCKEVENTS

	select USE_GENERIC_SMP_HELPERS

	help

	  This enables support for systems with more than one CPU. If you have

arch/arm/include/asm/localtimer.h

0 → 100644
+51 −0
Original line number Diff line number Diff line 
/*

 *  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



struct clock_event_device;



/*

 * Setup a per-cpu timer, whether it be a local timer or dummy broadcast

 */

void percpu_timer_setup(void);



/*

 * Called from assembly, this is the local timer IRQ handler

 */

asmlinkage void do_local_timer(struct pt_regs *);





#ifdef CONFIG_LOCAL_TIMERS

/*

 * Platform provides this to acknowledge a local timer IRQ.

 * Returns true if the local timer IRQ is to be processed.

 */

int local_timer_ack(void);



/*

 * Stop a local timer interrupt.

 */

void local_timer_stop(void);



/*

 * Setup a local timer interrupt for a CPU.

 */

void local_timer_setup(struct clock_event_device *);



#else



static inline void local_timer_stop(void)

{

}



#endif



#endif

arch/arm/include/asm/smp.h

+0 −40
Original line number Diff line number Diff line
@@ -55,11 +55,6 @@ extern void smp_store_cpu_info(unsigned int cpuid); 
 */

extern void smp_cross_call(const struct cpumask *mask);



/*

 * Broadcast a clock event to other CPUs.

 */

extern void smp_timer_broadcast(const struct cpumask *mask);



/*

 * Boot a secondary CPU, and assign it the specified idle task.

 * This also gives us the initial stack to use for this CPU.
@@ -100,44 +95,9 @@ extern void arch_send_call_function_single_ipi(int cpu); 
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);

#define arch_send_call_function_ipi_mask arch_send_call_function_ipi_mask



/*

 * Local timer interrupt handling function (can be IPI'ed).

 */

extern void local_timer_interrupt(void);



#ifdef CONFIG_LOCAL_TIMERS



/*

 * Stop a local timer interrupt.

 */

extern void local_timer_stop(void);



/*

 * Platform provides this to acknowledge a local timer IRQ

 */

extern int local_timer_ack(void);



#else



static inline void local_timer_stop(void)

{

}



#endif



/*

 * Setup a local timer interrupt for a CPU.

 */

extern void local_timer_setup(void);



/*

 * show local interrupt info

 */

extern void show_local_irqs(struct seq_file *);



/*

 * Called from assembly, this is the local timer IRQ handler

 */

asmlinkage void do_local_timer(struct pt_regs *);



#endif /* ifndef __ASM_ARM_SMP_H */

arch/arm/kernel/smp.c

+48 −8
Original line number Diff line number Diff line
@@ -22,6 +22,8 @@ 
#include <linux/smp.h>

#include <linux/seq_file.h>

#include <linux/irq.h>

#include <linux/percpu.h>

#include <linux/clockchips.h>



#include <asm/atomic.h>

#include <asm/cacheflush.h>
@@ -32,6 +34,7 @@ 
#include <asm/processor.h>

#include <asm/tlbflush.h>

#include <asm/ptrace.h>

#include <asm/localtimer.h>



/*

 * as from 2.5, kernels no longer have an init_tasks structure
@@ -274,9 +277,9 @@ asmlinkage void __cpuinit secondary_start_kernel(void) 
	local_fiq_enable();



	/*

	 * Setup local timer for this CPU.

	 * Setup the percpu timer for this CPU.

	 */

	local_timer_setup();

	percpu_timer_setup();



	calibrate_delay();
@@ -383,10 +386,16 @@ void show_local_irqs(struct seq_file *p) 
	seq_putc(p, '\n');

}



/*

 * Timer (local or broadcast) support

 */

static DEFINE_PER_CPU(struct clock_event_device, percpu_clockevent);



static void ipi_timer(void)

{

	struct clock_event_device *evt = &__get_cpu_var(percpu_clockevent);

	irq_enter();

	local_timer_interrupt();

	evt->event_handler(evt);

	irq_exit();

}
@@ -405,6 +414,42 @@ asmlinkage void __exception do_local_timer(struct pt_regs *regs) 
}

#endif



#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST

static void smp_timer_broadcast(const struct cpumask *mask)

{

	send_ipi_message(mask, IPI_TIMER);

}



static void broadcast_timer_set_mode(enum clock_event_mode mode,

	struct clock_event_device *evt)

{

}



static void local_timer_setup(struct clock_event_device *evt)

{

	evt->name	= "dummy_timer";

	evt->features	= CLOCK_EVT_FEAT_ONESHOT |

			  CLOCK_EVT_FEAT_PERIODIC |

			  CLOCK_EVT_FEAT_DUMMY;

	evt->rating	= 400;

	evt->mult	= 1;

	evt->set_mode	= broadcast_timer_set_mode;

	evt->broadcast	= smp_timer_broadcast;



	clockevents_register_device(evt);

}

#endif



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);



	local_timer_setup(evt);

}



static DEFINE_SPINLOCK(stop_lock);



/*
@@ -501,11 +546,6 @@ void smp_send_reschedule(int cpu) 
	send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);

}



void smp_timer_broadcast(const struct cpumask *mask)

{

	send_ipi_message(mask, IPI_TIMER);

}



void smp_send_stop(void)

{

	cpumask_t mask = cpu_online_map;

arch/arm/mach-realview/localtimer.c

+14 −56
Original line number Diff line number Diff line
@@ -11,10 +11,8 @@ 
#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>

#include <linux/io.h>
@@ -24,18 +22,6 @@ 
#include <mach/hardware.h>

#include <asm/irq.h>



static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);



/*

 * Used on SMP for either the local timer or IPI_TIMER

 */

void local_timer_interrupt(void)

{

	struct clock_event_device *clk = &__get_cpu_var(local_clockevent);



	clk->event_handler(clk);

}



#ifdef CONFIG_LOCAL_TIMERS



/* set up by the platform code */
@@ -44,7 +30,7 @@ void __iomem *twd_base; 
static unsigned long mpcore_timer_rate;



static void local_timer_set_mode(enum clock_event_mode mode,

				 struct clock_event_device *clk)

				 struct clock_event_device *evt)

{

	unsigned long ctrl;
@@ -140,32 +126,29 @@ static void __cpuinit twd_calibrate_rate(void) 
/*

 * Setup the local clock events for a CPU.

 */

void __cpuinit local_timer_setup(void)

void __cpuinit local_timer_setup(struct clock_event_device *evt)

{

	unsigned int cpu = smp_processor_id();

	struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);

	unsigned long flags;



	twd_calibrate_rate();



	clk->name		= "local_timer";

	clk->features		= CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;

	clk->rating		= 350;

	clk->set_mode		= local_timer_set_mode;

	clk->set_next_event	= local_timer_set_next_event;

	clk->irq		= IRQ_LOCALTIMER;

	clk->cpumask		= cpumask_of(cpu);

	clk->shift		= 20;

	clk->mult		= div_sc(mpcore_timer_rate, NSEC_PER_SEC, clk->shift);

	clk->max_delta_ns	= clockevent_delta2ns(0xffffffff, clk);

	clk->min_delta_ns	= clockevent_delta2ns(0xf, clk);

	evt->name		= "local_timer";

	evt->features		= CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;

	evt->rating		= 350;

	evt->set_mode		= local_timer_set_mode;

	evt->set_next_event	= local_timer_set_next_event;

	evt->irq		= IRQ_LOCALTIMER;

	evt->shift		= 20;

	evt->mult		= div_sc(mpcore_timer_rate, NSEC_PER_SEC, evt->shift);

	evt->max_delta_ns	= clockevent_delta2ns(0xffffffff, evt);

	evt->min_delta_ns	= clockevent_delta2ns(0xf, evt);



	/* Make sure our local interrupt controller has this enabled */

	local_irq_save(flags);

	get_irq_chip(IRQ_LOCALTIMER)->unmask(IRQ_LOCALTIMER);

	local_irq_restore(flags);



	clockevents_register_device(clk);

	clockevents_register_device(evt);

}



/*
@@ -176,29 +159,4 @@ void __cpuexit local_timer_stop(void) 
	__raw_writel(0, twd_base + TWD_TIMER_CONTROL);

}



#else	/* CONFIG_LOCAL_TIMERS */



static void dummy_timer_set_mode(enum clock_event_mode mode,

				 struct clock_event_device *clk)

{

}



void __cpuinit local_timer_setup(void)

{

	unsigned int cpu = smp_processor_id();

	struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);



	clk->name		= "dummy_timer";

	clk->features		= CLOCK_EVT_FEAT_ONESHOT |

				  CLOCK_EVT_FEAT_PERIODIC |

				  CLOCK_EVT_FEAT_DUMMY;

	clk->rating		= 400;

	clk->mult               = 1;

	clk->set_mode		= dummy_timer_set_mode;

	clk->broadcast		= smp_timer_broadcast;

	clk->cpumask		= cpumask_of(cpu);



	clockevents_register_device(clk);

}



#endif	/* !CONFIG_LOCAL_TIMERS */
 
#endif	/* CONFIG_LOCAL_TIMERS */