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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: Romain Perier <romain.perier@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Romain Perier 2014-07-19 13:03:26 +00:00 committed by Heiko Stuebner
parent 09af6a59fb
commit f54b91fdfa
1 changed files with 20 additions and 0 deletions
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20
arch/arm/mach-rockchip/platsmp.c
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@ -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);