forked from Minki/linux
42 lines
777 B
C
42 lines
777 B
C
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/*
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* CPU hotplug support for CSR Marco dual-core SMP SoCs
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*
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* Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company.
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*
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* Licensed under GPLv2 or later.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/smp.h>
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#include <asm/cacheflush.h>
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#include <asm/smp_plat.h>
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static inline void platform_do_lowpower(unsigned int cpu)
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{
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flush_cache_all();
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/* we put the platform to just WFI */
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for (;;) {
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__asm__ __volatile__("dsb\n\t" "wfi\n\t"
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: : : "memory");
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if (pen_release == cpu_logical_map(cpu)) {
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/*
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* OK, proper wakeup, we're done
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*/
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break;
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}
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}
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}
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/*
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* platform-specific code to shutdown a CPU
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*
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* Called with IRQs disabled
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*/
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void sirfsoc_cpu_die(unsigned int cpu)
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{
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platform_do_lowpower(cpu);
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}
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