msm: hotplug: support cpu hotplug on msm

obj-$(CONFIG_MSM_SMD) += last_radio_log.o

obj-$(CONFIG_MSM_SCM) += scm.o scm-boot.o

obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o

obj-$(CONFIG_MACH_TROUT) += board-trout.o board-trout-gpio.o board-trout-mmc.o devices-msm7x00.o

obj-$(CONFIG_MACH_TROUT) += board-trout.o board-trout-gpio.o board-trout-mmc.o board-trout-panel.o devices-msm7x00.o

obj-$(CONFIG_MACH_HALIBUT) += board-halibut.o devices-msm7x00.o

/*

 *  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 <linux/kernel.h>

#include <linux/errno.h>

#include <linux/smp.h>

#include <asm/cacheflush.h>

extern volatile int pen_release;

static inline void cpu_enter_lowpower(void)

{

	/* Just flush the cache. Changing the coherency is not yet

	 * available on msm. */

	flush_cache_all();

}

static inline void cpu_leave_lowpower(void)

{

}

static inline void platform_do_lowpower(unsigned int cpu)

{

	/* Just enter wfi for now. TODO: Properly shut off the cpu. */

	for (;;) {

		/*

		 * here's the WFI

		 */

		asm("wfi"

		    :

		    :

		    : "memory", "cc");

		if (pen_release == cpu) {

			/*

			 * OK, proper wakeup, we're done

			 */

			break;

		}

		/*

		 * getting here, means that we have come out of WFI without

		 * having been woken up - this shouldn't happen

		 *

		 * The trouble is, letting people know about this is not really

		 * possible, since we are currently running incoherently, and

		 * therefore cannot safely call printk() or anything else

		 */

		pr_debug("CPU%u: spurious wakeup call\n", cpu);

	}

}

int platform_cpu_kill(unsigned int cpu)

{

	return 1;

}

/*

 * platform-specific code to shutdown a CPU

 *

 * Called with IRQs disabled

 */

void platform_cpu_die(unsigned int cpu)

{

	/*

	 * we're ready for shutdown now, so do it

	 */

	cpu_enter_lowpower();

	platform_do_lowpower(cpu);

	/*

	 * bring this CPU back into the world of cache

	 * coherency, and then restore interrupts

	 */

	cpu_leave_lowpower();

}

int platform_cpu_disable(unsigned int cpu)

{

	/*

	 * we don't allow CPU 0 to be shutdown (it is still too special

	 * e.g. clock tick interrupts)

	 */

	return cpu == 0 ? -EPERM : 0;

}