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Commit 9680b3d0 authored by Martin Bogomolni's avatar Martin Bogomolni Committed by Arnd Bergmann
Browse files

ARM: highbank: Add cpu hotplug support 



This adds cpu hotplug for highbank. On highbank, a core is always reset and
boots up the same path as a cold boot.

Signed-off-by: default avatarMartin Bogomolni <martin@calxeda.com>
Signed-off-by: default avatarRob Herring <rob.herring@calxeda.com>
Reviewed-by: default avatarJamie Iles <jamie@jamieiles.com>
Reviewed-by: default avatarShawn Guo <shawn.guo@linaro.org>
parent 67388457

arch/arm/mach-highbank/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -2,3 +2,4 @@ obj-y := clock.o highbank.o system.o 
obj-$(CONFIG_DEBUG_HIGHBANK_UART)	+= lluart.o

obj-$(CONFIG_SMP)			+= platsmp.o

obj-$(CONFIG_LOCAL_TIMERS)		+= localtimer.o

obj-$(CONFIG_HOTPLUG_CPU)		+= hotplug.o

arch/arm/mach-highbank/hotplug.c

0 → 100644
+56 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2011 Calxeda, Inc.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/smp.h>



#include <asm/smp_scu.h>

#include <asm/cacheflush.h>



#include "core.h"



extern void secondary_startup(void);



int platform_cpu_kill(unsigned int cpu)

{

	return 1;

}



/*

 * platform-specific code to shutdown a CPU

 *

 */

void platform_cpu_die(unsigned int cpu)

{

	flush_cache_all();



	highbank_set_cpu_jump(cpu, secondary_startup);

	scu_power_mode(scu_base_addr, SCU_PM_POWEROFF);



	cpu_do_idle();



	/* We should never return from idle */

	panic("highbank: cpu %d unexpectedly exit from shutdown\n", cpu);

}



int platform_cpu_disable(unsigned int cpu)

{

	/*

	 * CPU0 should not be shut down via hotplug.  cpu_idle can WFI

	 * or a proper shutdown or hibernate should be used.

	 */

	return cpu == 0 ? -EPERM : 0;

}