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ARM: smp_scu: allow the platform code to read the SCU CPU status

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On Amlogic Meson8 / Meson8m2 (both Cortex-A9) and Meson8b (Cortex-A5)
the CPU hotplug code needs to wait until the SCU status of the CPU that
is being taken offline is SCU_PM_POWEROFF.
Provide a utility function (which can be invoked for example from
.cpu_kill()) which allows reading the SCU status of a CPU.

While here, replace the magic number 0x3 with a preprocessor macro
(SCU_CPU_STATUS_MASK) so we don't have to duplicate this magic number in
the new function.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
This commit is contained in:
Martin Blumenstingl
2017-09-17 18:45:20 +02:00
committed by Kevin Hilman
parent 0606326eff
commit 936a417443
2 changed files with 23 additions and 1 deletions
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6
arch/arm/include/asm/smp_scu.h
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@@ -28,6 +28,7 @@ static inline unsigned long scu_a9_get_base(void)
unsigned int scu_get_core_count(void __iomem *);
int scu_power_mode(void __iomem *, unsigned int);
int scu_cpu_power_enable(void __iomem *, unsigned int);
int scu_get_cpu_power_mode(void __iomem *scu_base, unsigned int logical_cpu);
#else
static inline unsigned int scu_get_core_count(void __iomem *scu_base)
{
@@ -42,6 +43,11 @@ static inline int scu_cpu_power_enable(void __iomem *scu_base,
{
return -EINVAL;
}
static inline int scu_get_cpu_power_mode(void __iomem *scu_base,
unsigned int logical_cpu)
{
return -EINVAL;
}
#endif
#if defined(CONFIG_SMP) && defined(CONFIG_HAVE_ARM_SCU)