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ARM: tegra: add cpu_disable for hotplug

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The Tegra114 could hotplug the CPU0, but the common cpu_disable didn't
support that. Adding a Tegra specific cpu_disable function for it.

Signed-off-by: Joseph Lo <josephl@nvidia.com>
[swarren: adjusted the switch statement to be future-proof]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Joseph Lo 2013-05-21 18:13:35 +08:00 committed by Stephen Warren
parent 33d5c01915
commit 510bb595de
3 changed files with 13 additions and 0 deletions
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1
arch/arm/mach-tegra/common.h
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@ -2,3 +2,4 @@ extern struct smp_operations tegra_smp_ops;
extern int tegra_cpu_kill(unsigned int cpu); extern int tegra_cpu_kill(unsigned int cpu);
extern void tegra_cpu_die(unsigned int cpu); extern void tegra_cpu_die(unsigned int cpu);
extern int tegra_cpu_disable(unsigned int cpu);

11
arch/arm/mach-tegra/hotplug.c
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@ -46,6 +46,17 @@ void __ref tegra_cpu_die(unsigned int cpu)
BUG(); BUG();
} }
int tegra_cpu_disable(unsigned int cpu)
{
switch (tegra_chip_id) {
case TEGRA20:
case TEGRA30:
return cpu == 0 ? -EPERM : 0;
default:
return 0;
}
}
void __init tegra_hotplug_init(void) void __init tegra_hotplug_init(void)
{ {
if (!IS_ENABLED(CONFIG_HOTPLUG_CPU)) if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))

1
arch/arm/mach-tegra/platsmp.c
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@ -196,5 +196,6 @@ struct smp_operations tegra_smp_ops __initdata = {
#ifdef CONFIG_HOTPLUG_CPU #ifdef CONFIG_HOTPLUG_CPU
.cpu_kill = tegra_cpu_kill, .cpu_kill = tegra_cpu_kill,
.cpu_die = tegra_cpu_die, .cpu_die = tegra_cpu_die,
.cpu_disable = tegra_cpu_disable,
#endif #endif
}; };