[linux-2.6-block.git] / arch / arm / mach-prima2 / hotplug.c

/*
 * CPU hotplug support for CSR Marco dual-core SMP SoCs
 *
 * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company.
 *
 * Licensed under GPLv2 or later.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>

#include <asm/smp_plat.h>
#include "common.h"

static inline void platform_do_lowpower(unsigned int cpu)
{
	/* we put the platform to just WFI */
	for (;;) {
		__asm__ __volatile__("dsb\n\t" "wfi\n\t"
			: : : "memory");
		if (prima2_pen_release == cpu_logical_map(cpu)) {
			/*
			 * OK, proper wakeup, we're done
			 */
			break;
		}
	}
}

/*
 * platform-specific code to shutdown a CPU
 *
 * Called with IRQs disabled
 */
void sirfsoc_cpu_die(unsigned int cpu)
{
	platform_do_lowpower(cpu);
}
Commit	Line	Data
4898de3d BS	1	/*
	2	* CPU hotplug support for CSR Marco dual-core SMP SoCs
	3	*
	4	* Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company.
	5	*
	6	* Licensed under GPLv2 or later.
	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/errno.h>
	11	#include <linux/smp.h>
	12
4898de3d	13	#include <asm/smp_plat.h>
6213f70e	14	#include "common.h"
4898de3d BS	15
	16	static inline void platform_do_lowpower(unsigned int cpu)
	17	{
4898de3d BS	18	/* we put the platform to just WFI */
	19	for (;;) {
	20	__asm__ __volatile__("dsb\n\t" "wfi\n\t"
	21	: : : "memory");
6213f70e	22	if (prima2_pen_release == cpu_logical_map(cpu)) {
4898de3d BS	23	/*
	24	* OK, proper wakeup, we're done
	25	*/
	26	break;
	27	}
	28	}
	29	}
	30
	31	/*
	32	* platform-specific code to shutdown a CPU
	33	*
	34	* Called with IRQs disabled
	35	*/
b96fc2f3	36	void sirfsoc_cpu_die(unsigned int cpu)
4898de3d BS	37	{
	38	platform_do_lowpower(cpu);
	39	}