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authorRomain Perier <romain.perier@gmail.com>2014-07-19 13:03:26 +0000
committerHeiko Stuebner <heiko@sntech.de>2014-07-23 11:42:29 +0200
commitf54b91fdfa7a1b5603d6d00f9972765662a4e6ef (patch)
tree28d1a042d7900baa26519e6418e7d946112b0c53 /arch/arm/mach-rockchip
parent09af6a59fb2cc4c88eae3ec884bfe6cb282ffa00 (diff)
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>
Diffstat (limited to 'arch/arm/mach-rockchip')
-rw-r--r--arch/arm/mach-rockchip/platsmp.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index 910835d4ccf4..189684f55927 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);