[mirror_ubuntu-zesty-kernel.git] / arch / arm / mach-ux500 / hotplug.c

/*
 * Copyright (C) STMicroelectronics 2009
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License v2
 *	Based on ARM realview platform
 *
 * Author: Sundar Iyer <sundar.iyer@stericsson.com>
 *
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>

#include <asm/cacheflush.h>
#include <asm/smp_plat.h>

#include <mach/setup.h>

/*
 * platform-specific code to shutdown a CPU
 *
 * Called with IRQs disabled
 */
void __ref ux500_cpu_die(unsigned int cpu)
{
	flush_cache_all();

	/* directly enter low power state, skipping secure registers */
	for (;;) {
		__asm__ __volatile__("dsb\n\t" "wfi\n\t"
				: : : "memory");
		if (pen_release == cpu_logical_map(cpu)) {
			/*
			 * OK, proper wakeup, we're done
			 */
			break;
		}
	}
}
Commit	Line	Data
9d704c04 SI	1	/*
	2	* Copyright (C) STMicroelectronics 2009
	3	* Copyright (C) ST-Ericsson SA 2010
	4	*
	5	* License Terms: GNU General Public License v2
	6	* Based on ARM realview platform
	7	*
	8	* Author: Sundar Iyer <sundar.iyer@stericsson.com>
	9	*
	10	*/
	11	#include <linux/kernel.h>
	12	#include <linux/errno.h>
	13	#include <linux/smp.h>
9d704c04 SI	14
9d704c04 SI	15	#include <asm/cacheflush.h>
eb50439b	16	#include <asm/smp_plat.h>
9d704c04	17
5ac21a94 MZ	18	#include <mach/setup.h>
5ac21a94 MZ	19
5ac21a94 MZ	20	/*
	21	* platform-specific code to shutdown a CPU
	22	*
	23	* Called with IRQs disabled
	24	*/
	25	void __ref ux500_cpu_die(unsigned int cpu)
9d704c04 SI	26	{
	27	flush_cache_all();
	28
5ac21a94	29	/* directly enter low power state, skipping secure registers */
9d704c04 SI	30	for (;;) {
	31	__asm__ __volatile__("dsb\n\t" "wfi\n\t"
	32	: : : "memory");
28763487	33	if (pen_release == cpu_logical_map(cpu)) {
9d704c04 SI	34	/*
	35	* OK, proper wakeup, we're done
	36	*/
	37	break;
	38	}
	39	}
	40	}