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ARM: rockchip: Add cpu hotplug support for RK3XXX SoCs

PATCH New Romain Perier 2 participants 2 messages Jul 19, 2014 – Jul 23, 2014

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Arm (32-bit) Arm sub-architectures Arm Rockchip
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Romain Perier

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PATCH v2 1/1 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 <[email protected]>
---
 arch/arm/mach-rockchip/platsmp.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
arch/arm/mach-rockchip/platsmp.c +20 -0
index 910835d..189684f 100644
@@ -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);
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#1 lore raw

PATCH v2 1/1 ARM: rockchip: Add cpu hotplug support for RK3XXX SoCs

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

Quoted 5 lines

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 <[email protected]>

works like a charm :-)

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

Heiko

Quoted 45 lines
---
 arch/arm/mach-rockchip/platsmp.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
(quoted diff) +0 -0

b/arch/arm/mach-rockchip/platsmp.c index 910835d..189684f 100644

arch/arm/mach-rockchip/platsmp.c +20 -0
@@ -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);