[PATCH v2] ARM: rockchip: Add cpu hotplug support for RK3XXX SoCs

[PATCH v2] ARM: rockchip: Add cpu hotplug support for RK3XXX SoCs

[Romain Perier]

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>
---
 arch/arm/mach-rockchip/platsmp.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index 910835d..189684f 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -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);
-- 
1.9.1

[PATCH v2] ARM: rockchip: Add cpu hotplug support for RK3XXX SoCs

[Heiko Stübner]

Am Samstag, 19. Juli 2014, 13:03:26 schrieb Romain Perier:
> 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>

works like a charm :-)

I've added it to my tree and will send it off in the next days.


Heiko

> ---
>  arch/arm/mach-rockchip/platsmp.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/arm/mach-rockchip/platsmp.c
> b/arch/arm/mach-rockchip/platsmp.c index 910835d..189684f 100644
> --- a/arch/arm/mach-rockchip/platsmp.c
> +++ b/arch/arm/mach-rockchip/platsmp.c
> @@ -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);