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Commit f54b91fd authored by Romain Perier's avatar Romain Perier Committed by Heiko Stuebner
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ARM: rockchip: Add cpu hotplug support for RK3XXX SoCs 



Adds ability to shutdown all CPUs except the first one
(since it might be special for a lot of platforms).
It is now possible to use kexec which requires such a feature.

Signed-off-by: default avatarRomain Perier <romain.perier@gmail.com>
Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
parent 09af6a59

arch/arm/mach-rockchip/platsmp.c

+20 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/of_address.h>



#include <asm/cacheflush.h>

#include <asm/cp15.h>

#include <asm/smp_scu.h>

#include <asm/smp_plat.h>

#include <asm/mach/map.h>
@@ -178,8 +179,27 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus) 
		pmu_set_power_domain(0 + i, false);

}



#ifdef CONFIG_HOTPLUG_CPU

static int rockchip_cpu_kill(unsigned int cpu)

{

	pmu_set_power_domain(0 + cpu, false);

	return 1;

}



static void rockchip_cpu_die(unsigned int cpu)

{

	v7_exit_coherency_flush(louis);

	while(1)

		cpu_do_idle();

}

#endif



static struct smp_operations rockchip_smp_ops __initdata = {

	.smp_prepare_cpus	= rockchip_smp_prepare_cpus,

	.smp_boot_secondary	= rockchip_boot_secondary,

#ifdef CONFIG_HOTPLUG_CPU

	.cpu_kill		= rockchip_cpu_kill,

	.cpu_die		= rockchip_cpu_die,

#endif

};

CPU_METHOD_OF_DECLARE(rk3066_smp, "rockchip,rk3066-smp", &rockchip_smp_ops);