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/*
* 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/cacheflush.h>
#include <asm/smp_plat.h>
static inline void platform_do_lowpower(unsigned int cpu)
{
flush_cache_all();
/* 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);
}
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