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
13#include <asm/smp_plat.h>
14
15static inline void platform_do_lowpower(unsigned int cpu)
16{
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 */
35void __ref sirfsoc_cpu_die(unsigned int cpu)
36{
37	platform_do_lowpower(cpu);
38}
39