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Commit 1b7f72fc authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Nicolas Pitre
Browse files

ARM: mach-ebsa110: move special idle code out of line 



... and hook it to arm_pm_idle.

Signed-off-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
parent 71e256c5

arch/arm/mach-ebsa110/core.c

+25 −0
Original line number Original line Diff line number Diff line
@@ -271,8 +271,33 @@ static struct platform_device *ebsa110_devices[] = { 
	&am79c961_device,

	&am79c961_device,

};

};





/*

 * EBSA110 idling methodology:

 *

 * We can not execute the "wait for interrupt" instruction since that

 * will stop our MCLK signal (which provides the clock for the glue

 * logic, and therefore the timer interrupt).

 *

 * Instead, we spin, polling the IRQ_STAT register for the occurrence

 * of any interrupt with core clock down to the memory clock.

 */

static void ebsa110_idle(void)

{

	const char *irq_stat = (char *)0xff000000;



	/* disable clock switching */

	asm volatile ("mcr p15, 0, ip, c15, c2, 2" : : : "cc");



	/* wait for an interrupt to occur */

	while (!*irq_stat);



	/* enable clock switching */

	asm volatile ("mcr p15, 0, ip, c15, c1, 2" : : : "cc");

}



static int __init ebsa110_init(void)

static int __init ebsa110_init(void)

{

{

	arm_pm_idle = ebsa110_idle;

	return platform_add_devices(ebsa110_devices, ARRAY_SIZE(ebsa110_devices));

	return platform_add_devices(ebsa110_devices, ARRAY_SIZE(ebsa110_devices));

}

}

arch/arm/mach-ebsa110/include/mach/system.h

+1 −20
Original line number Original line Diff line number Diff line
@@ -10,28 +10,9 @@ 
#ifndef __ASM_ARCH_SYSTEM_H

#ifndef __ASM_ARCH_SYSTEM_H

#define __ASM_ARCH_SYSTEM_H

#define __ASM_ARCH_SYSTEM_H





/*

 * EBSA110 idling methodology:

 *

 * We can not execute the "wait for interrupt" instruction since that

 * will stop our MCLK signal (which provides the clock for the glue

 * logic, and therefore the timer interrupt).

 *

 * Instead, we spin, polling the IRQ_STAT register for the occurrence

 * of any interrupt with core clock down to the memory clock.

 */

static inline void arch_idle(void)

static inline void arch_idle(void)

{

{

	const char *irq_stat = (char *)0xff000000;

	cpu_do_idle();



	/* disable clock switching */

	asm volatile ("mcr p15, 0, ip, c15, c2, 2" : : : "cc");



	/* wait for an interrupt to occur */

	while (!*irq_stat);



	/* enable clock switching */

	asm volatile ("mcr p15, 0, ip, c15, c1, 2" : : : "cc");

}

}





#endif
 
#endif