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| author | Martin Blumenstingl <martin.blumenstingl@googlemail.com> | 2017-09-17 18:45:20 +0200 |
|---|---|---|
| committer | Kevin Hilman <khilman@baylibre.com> | 2017-10-29 16:29:30 +0100 |
| commit | 936a4174435b376557ee2610eae03592baeb9016 (patch) | |
| tree | b8d99a90ee1526defb468a57775f679dd4efa2b4 /arch/arm/include | |
| parent | ARM: smp_scu: add a helper for powering on a specific CPU (diff) | |
| download | linux-936a4174435b376557ee2610eae03592baeb9016.tar.xz linux-936a4174435b376557ee2610eae03592baeb9016.zip | |
ARM: smp_scu: allow the platform code to read the SCU CPU status
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>
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/smp_scu.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/include/asm/smp_scu.h b/arch/arm/include/asm/smp_scu.h index 4c47bdfd4f61..1529d1ae2f8d 100644 --- a/arch/arm/include/asm/smp_scu.h +++ b/arch/arm/include/asm/smp_scu.h @@ -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) |