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authorGregory CLEMENT <gregory.clement@free-electrons.com>2014-10-30 14:39:44 +0300
committerJason Cooper <jason@lakedaemon.net>2014-11-22 05:14:38 +0300
commit626d686487bfd8136c4543bee7b6b2e52c33b3f8 (patch)
tree617c305f570d0d3f9550709e1acb6884824d5be5 /arch/arm/mach-mvebu/pmsu.c
parentf5789cbb22a01c0750d12cb54c4bbd416e04f7ff (diff)
downloadlinux-626d686487bfd8136c4543bee7b6b2e52c33b3f8.tar.xz
ARM: mvebu: Implement the CPU hotplug support for the Armada 38x SoCs
This commit implements the CPU hotplug support for the Marvell Armada 38x platform. Similarly to what was done for the Armada XP, this commit: * Implements the ->cpu_die() function of SMP operations by calling armada_38x_do_cpu_suspend() to enter the deep idle state for CPUs going offline. * Implements a dummy ->cpu_kill() function, simply needed for the kernel to know we have CPU hotplug support. * The mvebu_cortex_a9_boot_secondary() function makes sure to wake up the CPU if waiting in deep idle state by sending an IPI before deasserting the CPUs from reset. This is because mvebu_cortex_a9_boot_secondary() is now used in two different situations: for the initial boot of secondary CPUs (where CPU reset deassert is used to wake up CPUs) and for CPU hotplug (where an IPI is used to take CPU out of deep idle). * At boot time, we exit from the idle state in the ->smp_secondary_init() hook. This commit has been tested using CPU hotplug through sysfs (/sys/devices/system/cpu/cpuX/online) and using kexec. Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1414669184-16785-5-git-send-email-gregory.clement@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'arch/arm/mach-mvebu/pmsu.c')
-rw-r--r--arch/arm/mach-mvebu/pmsu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
index 5af58927a56d..5a757f929927 100644
--- a/arch/arm/mach-mvebu/pmsu.c
+++ b/arch/arm/mach-mvebu/pmsu.c
@@ -311,7 +311,7 @@ static int armada_370_xp_cpu_suspend(unsigned long deepidle)
return cpu_suspend(deepidle, armada_370_xp_pmsu_idle_enter);
}
-static int armada_38x_do_cpu_suspend(unsigned long deepidle)
+int armada_38x_do_cpu_suspend(unsigned long deepidle)
{
unsigned long flags = 0;