[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>

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 (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 __ref 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 BS	13	#include <asm/smp_plat.h>
	14
	15	static inline void platform_do_lowpower(unsigned int cpu)
	16	{
4898de3d BS	17	/* we put the platform to just WFI */
	18	for (;;) {
	19	__asm__ __volatile__("dsb\n\t" "wfi\n\t"
	20	: : : "memory");
	21	if (pen_release == cpu_logical_map(cpu)) {
	22	/*
	23	* OK, proper wakeup, we're done
	24	*/
	25	break;
	26	}
	27	}
	28	}
	29
	30	/*
	31	* platform-specific code to shutdown a CPU
	32	*
	33	* Called with IRQs disabled
	34	*/
b0db321b	35	void __ref sirfsoc_cpu_die(unsigned int cpu)
4898de3d BS	36	{
	37	platform_do_lowpower(cpu);
	38	}